Amethyst
Amethyst cluster from Magaliesburg, South Africa.
General
Category	Mineral variety
Chemical formula	Silica (silicon dioxide, SiO2)
Identification
Color	Purple, violet
Crystal habit	6-sided prism ending in 6-sided pyramid (typical)
Crystal system	rhombohedral class 32
Twinning	Dauphine law, Brazil law, and Japan law
Cleavage	None
Fracture	Conchoidal
Mohs scale hardness	7–lower in impure varieties
Luster	Vitreous/glossy
Streak	White
Diaphaneity	Transparent to translucent
Specific gravity	2.65 constant; variable in impure varieties
Optical properties	Uniaxial (+)
Refractive index	nω = 1.543–1.553 nε = 1.552–1.554
Birefringence	+0.009 (B-G interval)
Pleochroism	None
Melting point	1650±75 °C
Solubility	insoluble in common solvents
Other characteristics	Piezoelectric

Amethyst is a violet variety of quartz often used in jewelry. The name comes from the Ancient Greek ἀ a- ("not") and μέθυστος methustos ("intoxicated"), a reference to the belief that the stone protected its owner from drunkenness. The ancient Greeks and Romans wore amethyst and made drinking vessels of it in the belief that it would prevent intoxication. It is one of several forms of quartz. Amethyst is the traditional birthstone for February.

Structure[link]

Amethyst is a purple variety of quartz (SiO₂) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions.^[1][2][3] The hardness of the mineral is the same as quartz, thus it is suitable for use in jewelry.

Hue and tone[link]

Amethyst occurs in primary hues from a light pinkish violet to a deep purple. Amethyst may exhibit one or both secondary hues, red and blue. The ideal grade is called "Deep Siberian" and has a primary purple hue of around 75–80%, with 15–20% blue and (depending on the light source) red secondary hues.^[4] Green quartz is sometimes incorrectly called green amethyst, which is an actual misnomer and not an acceptable name for the material, the proper terminology being Prasiolite. It is actually against FTC Guidelines to call prasiolite green amethyst.^{[citation needed]} Other names for green quartz are vermarine, greened amethyst, or lime citrine.

Of very variable intensity, the color of amethyst is often laid out in stripes parallel to the final faces of the crystal. One aspect in the art of lapidary involves correctly cutting the stone to place the color in a way that makes the tone of the finished gem homogeneous. Often, the fact that sometimes only a thin surface layer of violet color is present in the stone or that the color is not homogeneous makes for a difficult cutting.

The color of amethyst has been demonstrated to result from substitution by irradiation of trivalent iron (Fe³⁺) for silicon in the structure,^[3][5] in the presence of trace elements of large ionic radius,^[2] and, to a certain extent, the amethyst color can naturally result from displacement of transition elements even if the iron concentration is low. Natural amethyst is dichroic in reddish violet and bluish violet,^[3] but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine,^[6] but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine.

Amethyst can fade in tone if overexposed to light sources and can be artificially darkened with adequate irradiation.^[3]

History[link]

Roman intaglio engraved gem of Caracalla in amethyst, once in the Treasury of Sainte-Chapelle.

Amethyst was used as a gemstone by the ancient Egyptians and was largely employed in antiquity for intaglio engraved gems.^[7]

The Greeks believed amethyst gems could prevent intoxication,^[8] while medieval European soldiers wore amethyst amulets as protection in battle – the reason for this being that amethysts are believed to heal people and keep them cool-headed.^[9] Beads of amethyst were found in Anglo-Saxon graves in England.^[10]

A large geode, or "amethyst-grotto", from near Santa Cruz in southern Brazil was presented at the 1902 exhibition in Düsseldorf, Germany.

In the 19th century, the color of amethyst was attributed to the presence of manganese. However, since it is capable of being greatly altered and even discharged by heat, the color was believed by some authorities to be from an organic source. Ferric thiocyanate has been suggested, and sulfur was said to have been detected in the mineral.^[11]

Synthetic amethyst[link]

Synthetic amethyst is produced by gamma-ray, x-ray or electron beam irradiation of clear quartz which has been first doped with ferric impurities. On exposure to heat, the irradiation effects can be partially cancelled and amethyst generally becomes yellow or even green, and much of the citrine, cairngorm, or yellow quartz of jewelry is said to be merely "burnt amethyst".^[12]

Synthetic amethyst is made to imitate the best quality amethyst. Its chemical and physical properties are so similar to that of natural amethyst that it can not be differentiated with absolute certainty without advanced gemnological testing (which is often cost-prohibitive). There is one test based on "Brazil law twinning" (a form of quartz twinning where right and left hand quartz structures are combined in a single crystal^[13]) which can be used to identify synthetic amethyst rather easily. It is possible to synthesize twinned amethyst, but this type is not available in large quantities in the market.^[4]

Mythology[link]

The Greek word "amethystos" may be translated as "not drunken", from Greek a-, "not" + methustos, "intoxicated".^[14] Amethyst was considered to be a strong antidote against drunkenness, which is why wine goblets were often carved from it. In Greek mythology, Dionysus, the god of intoxication, and of wine, was pursuing a maiden named Amethystos, who refused his affections. Amethystos prayed to the gods to remain chaste, a prayer which the goddess Artemis answered, transforming her into a white stone. Humbled by Amethystos's desire to remain chaste, Dionysus poured wine over the stone as an offering, dyeing the crystals purple.

Variations of the story include that Dionysus had been insulted by a mortal and swore to slay the next mortal who crossed his path, creating fierce tigers to carry out his wrath. The mortal turned out to be a beautiful young woman, Amethystos, who was on her way to pay tribute to Artemis. Her life was spared by Artemis, who transformed the maiden into a statue of pure crystalline quartz to protect her from the brutal claws. Dionysus wept tears of wine in remorse for his action at the sight of the beautiful statue. The god's tears then stained the quartz purple.^[15] Another variation involves the titan Rhea presenting Dionysus with the amethyst stone to preserve the wine-drinker's sanity.^[16]

Geographic distribution[link]

Amethyst is produced in abundance from the state of Minas Gerais in Brazil where it occurs in large geodes within volcanic rocks. Many of the hollow agates of southwestern Brazil and Uruguay contain a crop of amethyst crystals in the interior. Artigas, Uruguay and neighboring Brazilian state Rio Grande do Sul are large world producers exceeding in quantity Minas Gerais, as well as Mato Grosso, Espirito Santo, Bahia, and Ceará states, all amethyst producers of importance in Brazil.

It is also found and mined in South Korea. The largest opencast amethyst vein in the world is in Maissau, Lower Austria. Much fine amethyst comes from Russia, especially from near Mursinka in the Ekaterinburg district, where it occurs in drusy cavities in granitic rocks. Many localities in south India yield amethyst. One of the largest global amethyst producers is Zambia in southern Africa with an annual production of about 1000 tonnes.

Amethyst occurs at many localities in the United States.^[11] Among these may be mentioned: the Mazatzal Mountain region in Gila and Maricopa Counties, Arizona; Red Feather Lakes, near Ft Collins, Colorado; Amethyst Mountain, Texas; Yellowstone National Park; Delaware County, Pennsylvania; Haywood County, North Carolina; Deer Hill and Stow, Maine and in the Lake Superior region of Minnesota, Wisconsin, Michigan, and Ontario in Canada. Amethyst is relatively common in Ontario, and in various locations throughout Nova Scotia. The largest amethyst mine in North America is located in Thunder Bay, Ontario.

An amethyst geode that formed when large crystals grew in open spaces inside the rock.

Value[link]

Up until the 18th century, amethyst was included in the cardinal, or most valuable, gemstones (along with diamond, sapphire, ruby, and emerald). However, since the discovery of extensive deposits in locations such as Brazil, it has lost most of its value.

Collectors look for depth of color, possibly with red flashes if cut conventionally.^[17] The highest grade amethyst (called "Deep Russian") is exceptionally rare and therefore, when one is found, its value is dependent on the demand of collectors. It is, however, still orders of magnitude lower than the highest grade sapphires or rubies (padparadscha sapphire or "pigeon's blood" ruby).^[4]

See also[link]

• List of minerals
• Specimen Ridge

References[link]

Attribution

•  This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Amethyst". Encyclopædia Britannica (11th ed.). Cambridge University Press. 

External links[link]

Wikimedia Commons has media related to: Amethyst

• Mindat: mineralogical information, crystallography and nomenclature
• gemstone.org - International colored Gemstone Association

MF DOOM
MF Doom at the Hultsfred Festival 2011 in Sweden
Background information
Also known as	DOOM, King Geedorah, Metal Face, Metal Fingers, Viktor Vaughn, Zev Love X, Madvillain
Born	(1971-01-09) January 9, 1971 (age 41) London, United Kingdom
Origin	Long Island, New York
Genres	East Coast hip hop
Occupations	Rapper, hip hop producer
Instruments	Vocals, sampler, synthesizer, drum machine, Pro Tools
Years active	1988–1993 1997–present
Labels	Elektra (1988–1993) Sub Verse (1997–2003) Fondle 'Em (1997–2001) Metal Face (1997–present) Big Dada (2003) Naturesounds (2003–present) Rhymesayers (2004) Stones Throw (2004–present) Lex (2005–present)
Associated acts	KMD, Madvillain, Danger Doom, Madlib, MF Grimm, Ghostface Killah, J Dilla, Count Bass D, Aesop Rock, Jneiro Jarel, Gorillaz, Masta Ace, De La Soul
Website	Official website

Daniel Dumile (pronounced /ˈduːmɨleɪ/ DOO-mə-lay; born January 9, 1971) is a hip hop artist who has taken on several stage names in his career, most notably MF Doom, often stylized as MF DOOM, where the "MF" stands for metal face, but metal fingers when using his producing name. He has appeared in several collaborative projects such as Danger Doom (with Danger Mouse) and Madvillain (with Madlib).

History[link]

Early years with KMD[link]

Dumile was born on January 9, 1971, in London, England, the son of a Trinidadian mother and Zimbabwean father.^[1] He then moved with his family to New York and was raised in the city of Long Beach, New York on Long Island.

As Zev Love X, he formed the group KMD in 1988 with his younger brother DJ Subroc and another MC called Rodan. When Rodan left the group, Zev found another MC to replace Rodan named Onyx the Birthstone Kid.^[1] A&R rep Dante Ross learned of KMD through the hip hop group 3rd Bass, and signed the group to Elektra Records.^[2]

Dumile and KMD's recorded debut came on 3rd Bass's song "The Gas Face" from The Cactus Album,^[1] followed in 1991 with KMD's album Mr. Hood, which became a minor hit through its singles "Peachfuzz", "Who Me?" and heavy video play on cable TV's Yo! MTV Raps and Rap City.

Subroc was struck and killed by a car in 1993 while attempting to cross the Long Island Expressway before the release of a second KMD album, titled Black Bastards.^[1] The group was subsequently dropped from Elektra Records that same week. Before the release of the album, it was shelved due to controversy over its cover art,^[2] which featured a cartoon of a stereotypical pickaninny or sambo character being hung from the gallows.

With the loss of his brother, Dumile retreated from the hip hop scene from 1994 to 1997. He testifies to disillusionment and depression, living "damn near homeless, walking the streets of Manhattan, sleeping on benches.^[1][3]" In the late 1990s, he left New York City and settled in Atlanta. According to interviews with Dumile, he was also "recovering from his wounds" and swearing revenge "against the industry that so badly deformed him."^[1] Black Bastards had become bootlegged at the time, leading to Doom's rise in the underground hip hop scene.

Birth of MF DOOM[link]

In 1997, Dumile began freestyling incognito at open-mic events at the Nuyorican Poets Café in Manhattan, obscuring his face by putting a stocking over his head. He meanwhile had taken on a new identity, MF Doom, patterned after and wearing a mask similar to that of Marvel Comics super-villain Doctor Doom, who is depicted rapping on the cover of the 1999 album Operation: Doomsday. He wears this mask while performing and isn't photographed without it, except for very short glimpses in videos such as Viktor Vaughn's "Mr. Clean", "?", and in earlier photos with KMD.^[1] MF Doom's mask has undergone at least one design revision since its adoption (it is now an altered version of the mask worn by the character Maximus Decimus Meridius in the film Gladiator).

Early career[link]

Dumile released three singles on "Bobbito" García's Fondle 'Em Records, "Dead Bent", and "Greenbacks" (1997), and "The M.I.C." (1998). In 1999 Fondle 'Em released MF Doom's first full-length LP, Operation: Doomsday, which included these singles and their b-sides, and additional tracks. Dumile had used the spelling variant "M.F. DOOM" for the singles releases, but thereafter changed this to "MF DOOM".

Among the collaborators on these tracks were fellow members of the Monsta Island Czars collective (The M.I.C.), for which each artist took on the persona of a monster from the Godzilla mythos. Dumile went by the alias "King Geedorah," a three-headed golden dragon space monster, modeled after King Ghidorah, the Toho movie monster who was a three-headed dragon that often battled Godzilla. Some of his appearances on the LP are as, and are credited to this persona, instead of that of MF Doom. Dumile would revisit this character later under various name-spellings.

Guest appearances, production, and instrumental work[link]

In the years intervening before his next full-length solo release, and continually since, Dumile has appeared on several tracks on other artists' LPs and remixes, contributed one-off tracks to compilations, and done various guest production work.^[4]

In 2002, he appeared on the Sound-Ink's Colapsus collection,on a very hard to find track titled "Monday Nite at Fluid" featuring Kurious with production by King Honey, who also produced some tracks for Dumile's album Vaudeville Villain. DOOM also made an appearance in "November Has Come", a track on Gorillaz's 2005 album Demon Days, which reached #6 on the Billboard 200.^[5]

Besides the Viktor Vaughn album Dumile produces all the instrumentation tracks for his solo releases with very few exceptions.^[4]

Beginning in 2001, under the "Metal Fingers" moniker, Dumile began releasing his Special Herbs instrumentals series. Many of these beats can be heard as the instrumentation tracks throughout his body of work. A separate website catalogs for which tracks each instrumental has been used.^[6]

Ongoing career[link]

In 2003, Dumile released the King Geedorah album Take Me to Your Leader. Geedorah is credited as producer, but only appears as an MC on four tracks. The majority of vocal tracks feature guest MCs, and the album features several instrumental montages of sampled vocals from old movies and TV shows—a technique employed on most of Dumile's albums. Both Venomous Villain and Take Me to Your Leader feature appearances by MF Doom.

Also in 2003, Dumile released the LP Vaudeville Villain under the moniker Viktor Vaughn (another play on Doctor Doom, whose "real name" is Victor von Doom). In 2004 he released a follow-up LP, Venomous Villain (also called VV2).

And, in 2004, the second MF Doom album MM.. Food was released by the Minnesota-based label Rhymesayers Entertainment.

Mainstream recognition[link]

DOOM's first commercial breakthrough came in 2004, with the album Madvillainy, created with producer Madlib under the group name Madvillain. Released by Stones Throw Records, the album was a critical and commercial success. MF DOOM was seen by mainstream audiences for the first time as Madvillain received publicity and acclaim in publications such as Rolling Stone, The Washington Post, The New York Times, The New Yorker, and Spin. A video for "All Caps" and a four-date U.S. tour followed the release of Madvillainy. Additional videos for "Rhinestone Cowboy" and "Accordion", both directed by Andrew Gura, were released on the DVDs Stones Throw 101 and Stones Throw 102: In Living the True Gods, respectively.

MF Doom collaborated with Danger Mouse who together are known as DANGERDOOM.

Though still an independent artist, MF DOOM took a bigger step towards the mainstream in 2005 with The Mouse and the Mask, a collaboration with producer DJ Danger Mouse under the group name Danger Doom. The album, released on October 11, 2005 by Epitaph, was done in collaboration with Cartoon Network's Adult Swim and featured voice-actors and characters from its programs (mostly Aqua Teen Hunger Force). Danger Doom reached #41 on the Billboard 200.^[7] In 2006 DOOM hosted the Adult Swim Christmas special and he could be seen in between shows, usually talking about what was up next, and making jokes.

2006–2009[link]

MF Doom produced tracks for both of Ghostface Killah's 2006 albums Fishscale and More Fish, and the two are currently at work on a collaboration album titled Swift & Changeable. So far only track released from the album is "Angels", which appeared on a Nature Sounds compilation in late 2006, and later re-released in a different fashion on Doom's 2009 album Born Like This. Doom has also revealed plans for a second Madvillain album with producer Madlib, with one song, "Monkey Suite", first appearing on the Adult Swim/Stones Throw Records album Chrome Children, later it appeared on Madvillainy 2 - The Madlib Remix. Other potential projects mentioned by Doom include new albums from Danger Doom,^[8] KMD, as well as further albums under both his Viktor Vaughn and King Geedorah aliases. However, many such Doom projects have been rumored in recent years without materializing.

Despite no new Doom releases in 2006, Kidrobot and Stones Throw released an 8" tall Madvillain toy available to coincide with the release of the Chrome Children CD/DVD (hosted by Peanut Butter Wolf) which featured a DVD performance of Madvillain and several other Stones Throw artists. Doom also continued to work with Adult Swim doing voice-over work as Sherman the Giraffe on Perfect Hair Forever, being the voice for The Boondocks ads and previews and hosting their Christmas Eve 2006 programming.

In late January 2009, Lex records confirmed Doom's new album title to be Born Like This, and that the "MF" would be dropped from his name, now just "DOOM".^[9] The album was released worldwide on March 24, 2009.^[10] As a teaser, the track "Ballskin" was posted on Doom's Myspace page on January 13, 2009.^[11] Snippets of the entire album were made available for streaming on Doom's Myspace on the album's release date. The title for the album was inspired by the poem "Dinosauria, We" by poet and writer Charles Bukowski. Doom samples a performance of the poem by Bukowski on the track "Cellz". Previously, Doom used a Bukowski sample for a vocal interlude on 2004's "All Outta Ale.^[12] "Thom Yorke of Radiohead remixed the track "Gazillion Ear" which is available as an iTunes-only bonus track.^[13] June 26, 2009 Kurious released II which featured Doom on the song "Benetton".^[14]

2009-2012[link]

On May 26, 2010, the second single for the next Madvillain album "Paper Mill" was released through Adult Swim.^[15] Expektoration, a live Doom album, was released on September 14, 2010 through Gold Dust Media. In mid 2010, DOOM released the mix-tape "DOOM!", a collection of greatest hits, B-sides and rareties, including the theme for the video game Grand Theft Auto: Chinatown Wars featuring Ghostface Killah, and Biochemical Equation, featuring the RZA.

On July 27, 2011 DOOM and Ghostface Killah released the track "Victory Laps" from their long awaited collaboration project Swift & Changeable on the Nature Sounds label.

DOOM was chosen by Portishead to perform at the ATP I'll Be Your Mirror festival that they curated in July 2011 at London's Alexandra Palace.^[16]

DOOM will be the guest curator for Chapter 48 of Frank151's quarterly magazine. Chapter 48 will be released Summer 2012 and will feature a candid interview with DOOM on a variety of topics.^[17]

In September DOOM will be performing live as part of Bestival 2012 on the Isle Of Wight.^[18]

Live show controversy[link]

Dumile has become infamous for allegedly sending imposters to perform on his behalf.^[19] Doom initially countered such accusations by claiming that he lost weight and thus looked - and sounded - different,^[20] before his road manager described the move as an intentional choice made by Dumile.^[21] For his 2011 UK tour, a promoter for the Glasgow show - fearing reduced attendance from a cautious public - guaranteed on Twitter that Dumile would be appearing in person.

Discography[link]

Solo[link]

• 1999: Operation: Doomsday
• 2003: Take Me to Your Leader (as King Geedorah)
• 2003: Vaudeville Villain (as Viktor Vaughn)
• 2004: Venomous Villain (as Viktor Vaughn)
• 2004: Mm.. Food
• 2009: Born Like This (as DOOM)

Compilation Albums[link]

• 2009: Unexpected Guests

Collaboration Albums[link]

• 1991: Mr. Hood (as Zev Love X with KMD)
• 2001: Black Bastards (as Zev Love X with KMD)
• 2003: Escape from Monsta Island! (as King Geedorah with Monsta Island Czars)
• 2004: Madvillainy (with Madlib as Madvillain)
• 2005: The Mouse and the Mask (with Danger Mouse as DANGERDOOM)
• 2006: Occult Hymn (with Danger Mouse as DANGERDOOM)
• 2012: Son of Yvonne (with Masta Ace as MA DOOM)
• 2012: Key to the Kuffs (with Jneiro Jarel as JJ DOOM) ^[22]
• TBA: Swift & Changeable (with Ghostface Killah as DOOMSTARKS)

References[link]

External links[link]

Wikiquote has a collection of quotations related to: Daniel Dumile

• MF Doom on Myspace
• Official website