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

Kenny Larkin (who also releases as Dark Comedy) is an American techno producer from Detroit. He has been described by Allmusic as "massively influential" on American, British, and German techno.^[1]

Larkin was born and raised in Detroit, but did not participate in the early years of Detroit techno because he was serving in the military. Upon his return, he began producing, influenced by Juan Atkins and Derrick May, as well as the Chicago house music scene.^[1] His early single releases, "We Shall Overcome" and "Integration", were issued on Plus 8, a label overseen by Richie Hawtin and John Acquaviva; later released appeared on Buzz and Warp as well as other labels. His records have seen more success in continental Europe than in the U.S..

Late in the 1990s, Larkin began working as a stand-up comedian into the 2000s. His musical output has slowed as a result.

Discography[link]

References[link]

External links[link]

• Kenny Larkin discography at Discogs.

Saul Stacey Williams (born February 29, 1972) is an American poet, writer, actor and musician known for his blend of poetry and alternative hip hop and for his leading role in the 1998 independent film Slam.

Biography[link]

The youngest of three children, Williams was born in Newburgh, New York. He attended Newburgh Free Academy for high school, where he would write his song "Black Stacey." After graduating from Morehouse College with a B.A. in acting and philosophy, Williams moved to New York City to earn an MFA in Acting from New York University's prestigious Graduate Acting Program at the Tisch School of the Arts.^[1][2] There he found himself at the center of the New York cafe poetry scene.

Williams and artist Marcia Jones began their relationship in 1995 as collaborative artists on the Brooklyn performance art and spoken word circuit. Their daughter, Saturn, was born in 1996.^[3] His collection of poems S/HE is a series of reflections on the demise of the relationship.^[4] Marcia Jones,^[5] a visual artist and art professor, created the cover artwork for The Seventh Octave, images throughout S/HE in response to Williams, and set-designed his 2001 album Amethyst Rock Star. Saturn has recently been performing with her father on his 2008 concert tour.^{[6] [7]}

On his 36th birthday, February 29, 2008, Williams married his girlfriend of five years, actress Persia White. Williams met White in 2003 when he made a guest appearance on the TV show Girlfriends as a poet named Sivad. (1993).^[8][9] On January 17, 2009, White announced via her Myspace blog that she and Williams were no longer together.^[10]

Williams is a vegan.^[11]

Career[link]

By 1995, he had become an open mic poet and, in 1996, he won the title of Nuyorican Poets Cafe's Grand Slam Champion. The documentary film SlamNation follows Williams and the other members of the 1996 Nuyorican Poets Slam team (Beau Sia, Mums da Schemer and Jessica Care Moore) as they compete in the 1996 National Poetry Slam held in Portland, Oregon.

The following year, Williams landed the lead role in the 1998 feature film Slam. Williams featured as both a writer and actor^[12] on the film, which would win both the Sundance Festival Grand Jury Prize and the Cannes Camera D'Or (Golden Camera)^[13] and serve to introduce Williams to international audiences.

Williams was at this time breaking into music. He had performed with such artists as Nas, The Fugees, Christian Alvarez, Blackalicious, Erykah Badu, KRS-One, Zack De La Rocha, De La Soul, and DJ Krust, as well as poets Allen Ginsberg and Sonia Sanchez. After releasing a string of EPs, in 2001 he released the LP Amethyst Rock Star with producer Rick Rubin and in September 2004 his self-titled album to much acclaim. He played several shows supporting Nine Inch Nails on their European tour in summer 2005, and has also supported The Mars Volta.

Williams was also invited to the Lollapalooza music festival in Summer 2005. The Chicago stage allowed Williams to attract a wider audience. He also appeared on NIN's album Year Zero, and supported the group on their 2006 North American tour. On the tour Williams announced that Trent Reznor would co-produce his next album.^[14]

This collaboration resulted in 2007's The Inevitable Rise and Liberation of NiggyTardust!. This album was available only at the website until a physical CD of the album was issued. The physical release included new tracks and extended album artwork.^[15] The first 100,000 customers on the website had the option to download a free lower-quality audio version of the album. The other option was for users to pay $5 to support the artist directly and be given the choice of downloading the higher-quality MP3 version or the lossless FLAC version. The material has been produced by Trent Reznor and mixed by Alan Moulder. It was Reznor who said that, after his own recent dealings with record labels, they should release it independently and directly.^[16]

As a writer, Williams has been published in The New York Times, Esquire, Bomb Magazine and African Voices, as well as having released four collections of poetry. As a poet and musician, Williams has toured and lectured across the world, appearing at many universities and colleges. In his interview in the book, Words in Your Face: A Guided Tour Through Twenty Years of the New York City Poetry Slam, Williams explained why he creates within so many genres, saying:

Williams is a vocal critic of the War on Terrorism and the wars in Iraq and Afghanistan;^[18] among his better-known works are the anti-war anthems "Not In My Name" and "Act III Scene 2 (Shakespeare)". In early 2008, a Nike Sparq Training commercial featured Williams's song "List of Demands (Reparations)".

In a November 2008 interview with Wired.com, Williams talked about his forthcoming projects:

...but there's one [album] that I'm waist-deep into. I'm aiming to finish it up next month. Trent wants to work on a sequel for Niggy that I think would be cool and I also have an album and new songs demoed at home that I'm ready to go into the studio and lay down. It’s a complete reflection of how I feel in this country; it's a very transformative time.^[19]

In January 2009, he released NGH WHT – The Dead Emcee Scrolls with The Arditti Quartet, a reading of his 2006 poetry book of the same name. This collaboration with Thomas Kessler (who also set ,said the shotgun to the head to music) is released with two payment options: listeners may download Chapters 18-22 of the 27-minute composition for free (in mp3 format), or for $6, can download the entire 33-chapter composition in lossless .aif format, along with the isolated vocal and quartet multitrack stems. The entire paid download totals in size at 563 Megabyte.^[20]

He currently resides in Paris, France. He has contributed to two tracks on the 2011 album Baba Love by French musician Arthur H.^[21]

Williams latest album, Volcanic Sunlight' was released November 11, 2011. Williams showcased the album at London's Hoxton Bar Kitchen on January 26, 2011. Livemusic.fm interviewed Williams on the evening and made a subsequent film. Artist Alex Templeton-Ward produced the film. When Williams was asked what the point of poetry was he said: "I'm making this up, I have no idea but here we go, I think that it would be to express, to share, to relieve, to explore", "for me poetry offers some what of a cathartic experience. I am able to move through emotions and emotional experience particularly, you know, break-ups, difficulties in all the things that I may face, whether that is with an industry or a loved one or whomever, there needs to be an infiltration process, like you have a window open over there. That is the purpose of poetry – it is the window that opens that allows some air in, some other insight, some other possibility so we can explore all that we feel, all that we think but with the space to see more than what we know, because there is so much more than we know", "If I didn't open myself to the possibilities of the unknown then I would be lost."

Discography[link]

Albums/EPs[link]

• Penny for a Thought / Purple Pigeons (2000)
• Amethyst Rock Star (2001)
• Not in My Name (2003)
• Saul Williams (2004)
• The Inevitable Rise and Liberation of NiggyTardust! (2007)
• NGH WHT – The Dead Emcee Scrolls with The Arditti Quartet (2009)
• Volcanic Sunlight (2011)

Guest and compilation appearances[link]

• "Twice the First Time" on Eargasms – Crucialpoetics Vol. 1 (1997)
• "Elohim (1972)" on Black Whole Styles (1998)
• "Ohm" on Lyricist Lounge, Volume One (1999)
• "Coded Language" on Coded Language by DJ Krust (1999)
• "Release" with Lyrics Born and Zack De La Rocha on Blazing Arrow by Blackalicious (2002)
• "Time (Jungle) (Temple Of Soul Mix)" on Nublu Sessions, mixed by Wax Poetic (2003)
• "Sent from Sandy Shores" (with Sacajawea) on Dreams of Water Themes by Adventure Time (2003)
• "Wake up Show Freestyles" by Sway and King Tech (2004)
• "Three Fingers" on Enter the Chicken by Buckethead & Friends (2005)
• "Sea Lion (Extended)" (with Will Oldham) on "Sea Lion" by Sage Francis (2005)
• "Mr. Nichols" on Sound Mirrors by Coldcut (2006)
• "April Showers, April Tears" on ¿What by Stuart Davis (2006)
• ",said the shotgun to the head" on Thomas Kessler by Thomas Kessler (2006)
• "Survivalism" and "Me, I'm Not" on Year Zero by Nine Inch Nails (2007)
• "Gunshots By Computer" and "Survivalism" on Y34RZ3R0R3M1X3D by Nine Inch Nails (2007)
• "Lyrical Gunplay" on Thru by Thavius Beck
• "Dance Of The Dead" on The Unbound Project, Vol. 1 a compilation benefit album for Mumia Abu-Jamal
• "List Of Demands" on Nike Sparq Commercial
• "Black Stacy Remix" ft. Nas
• "U Can Do It" (with Maeckes) on "KIDS" by Maeckes (2010)
• "Dance or Die" on The ArchAndroid by Janelle Monáe (2010)

Bibliography[link]

• The Seventh Octave, 1998, Moore Black Press ISBN 0-9658308-1-0
• She, 1999, MTV/Pocketbooks ISBN 0-671-03977-6
• Said the Shotgun to the Head, 2003, MTV/Pocketbooks ISBN 0-7434-7079-6
• The Dead Emcee Scrolls, 2006, MTV/Pocketbooks ISBN 1-4165-1632-8
• Chorus, 2012, MTV Books ISBN 1-4516-4983-5 ^[22]

Filmography[link]

• Downtown 81 (voice) (1981/2000)
• Underground Voices (1996)
• Slam (1998)
• SlamNation (1998)
• I'll Make Me a World (1999)
• King Of The Korner (2000)
• K-PAX (2001)
• The N Word (2004)
• Lackawanna Blues (2005)

References[link]

External links[link]

• Official Site
• Saul Williams at Discogs
• Saul Williams at the Internet Movie Database
• Saul Williams: Volcanic Sunlight