Dolomite
Dolomite and magnesite – Spain
General
Category	Carbonate mineral
Chemical formula	(CaMg)(CO3)2
Strunz classification	05.AB.10
Crystal symmetry	Trigonal rhombohedral, 3
Unit cell	a = 4.8012(1) Å, c = 16.002 Å; Z = 3
Identification
Color	White, gray to pink
Crystal habit	Tabular crystals, often with curved faces, also columnar, stalactitic, granular, massive.
Crystal system	Trigonal
Twinning	Common as simple contact twins
Cleavage	Perfect on {1011}, rhombohedral cleavage
Fracture	Conchoidal
Tenacity	Brittle
Mohs scale hardness	3.5 to 4
Luster	Vitreous to pearly
Streak	White
Specific gravity	2.84–2.86
Optical properties	Uniaxial (-)
Refractive index	nω = 1.679–1.681 nε = 1.500
Birefringence	δ = 0.179–0.181
Solubility	Poorly soluble in dilute HCl unless powdered.
Other characteristics	May fluoresce white to pink under UV; triboluminescent.
References	[1][2][3][4]

Dolomite ( /ˈdɒləmaɪt/) is a carbonate mineral composed of calcium magnesium carbonate CaMg(CO₃)₂. The term is also used to describe the sedimentary carbonate rock dolostone.

Dolostone (dolomite rock) is composed predominantly of the mineral dolomite with a stoichiometric ratio of 50% or greater content of magnesium replacing calcium, often as a result of diagenesis. Limestone that is partially replaced by dolomite is referred to as dolomitic limestone, or in old U.S. geologic literature as magnesian limestone. Dolomite was first described in 1791 as a rock by the French naturalist and geologist, Déodat Gratet de Dolomieu (1750–1801) from exposures in what are now known as the Dolomite Alps of northern Italy.

Uses[link]

Dolomite with chalcopyrite from the Tri-state district, Cherokee County, Kansas (size: 11.4×7.2×4.6 cm)

Dolomite is used as an ornamental stone, a concrete aggregate, a source of magnesium oxide and in the Pidgeon process for the production of magnesium. It is an important petroleum reservoir rock, and serves as the host rock for large strata-bound Mississippi Valley-Type (MVT) ore deposits of base metals such as lead, zinc, and copper. Where calcite limestone is uncommon or too costly, dolomite is sometimes used in its place as a flux for the smelting of iron and steel. Large quantities of processed dolomite are used in the production of float glass.

In horticulture, dolomite and dolomitic limestone are added to soils and soilless potting mixes to lower their acidity and as a magnesium source. Home and container gardening are common examples of this use.

Dolomite is also used as the substrate in marine (saltwater) aquariums to help buffer changes in pH of the water.

Particle physics researchers prefer to build particle detectors under layers of dolomite to enable the detectors to detect the highest possible number of exotic particles. Because dolomite contains relatively minor quantities of radioactive materials, it can insulate against interference from cosmic rays without adding to background radiation levels.^[5]

See also[link]

Wikimedia Commons has media related to: Dolomite

• List of minerals
• Evaporite

References[link]

Scott Henderson (2010)

Scott Henderson (born August 26, 1954) is a jazz fusion and blues guitarist best known for his work with the band Tribal Tech.

Early days[link]

Born in West Palm Beach, Florida, Henderson began playing guitar at an early age. His formative musical years were spent listening to rock, blues, funk and soul, while his interest in jazz developed later on, thanks to the music of John Coltrane, Miles Davis and others. He still professes to being a blues player at heart.

After graduating from Florida Atlantic University, Henderson moved to Los Angeles and began his career in earnest, playing and recording with violinist Jean-Luc Ponty, bassist Jeff Berlin and "Players", and Weather Report's Joe Zawinul. Henderson first began receiving serious attention as the original guitarist for the Chick Corea Elektric Band. But he stayed only six months with Corea and left after some major clash.

Tribal Tech[link]

Henderson formed Tribal Tech with bass player Gary Willis in 1984. Under the direction of Henderson and Willis, Tribal Tech became one of the most highly-regarded fusion bands of the 1990s. He toured and recorded with the band up until their dissolution following the 2000 album Rocket Science, and during that time brought himself to the forefront of modern jazz/fusion guitar playing. In 1991 he was named '#1 Jazz Guitarist' by Guitar World magazine, and in January 1992 he was voted best jazz guitarist in Guitar Player magazine's Annual Reader's Poll.

Recent recordings[link]

Henderson has more recently moved back to his blues roots, releasing the blues album Dog Party in 1994, and Tore Down House (1997). He recorded Well To The Bone (2003) with bass player, John Humphrey, and Kirk Covington on drums. His latest solo release Scott Henderson Live (2005) follows in this vein, and his work has also moved into funk/jazz fusion. He has repeatedly stated that he is enjoying playing in bands which do not have keyboard players, as it allows him to branch out more and properly explore the guitar's full potential as an instrument.

Henderson is also a member of the fusion supergroup Vital Tech Tones with Victor Wooten and Steve Smith, which has released two CDs as of 2006.

Henderson has appeared as a guest artist on a number of recordings including Scott Kinsey's 2006 CD Kinesthetics, Amber Whitlock's The Colours Of Life, and Rob Whitlock's Sketchin' and Sketchin' 2.

Henderson teaches at the Guitar Institute of Technology, which is part of the Musicians Institute in Hollywood, California. He has released two instructional guitar videos.

Discography[link]

With Tribal Tech:

• Spears (1985)
• Dr. Hee (1987)
• Nomad (1990)
• Tribal Tech (1991)
• Illicit (1992)
• Face First (1993)
• Reality Check (1995)
• Thick (1999)
• Rocket Science (2000)
• X (2011)

With Vital Tech Tones (Henderson, Victor Wooten and Steve Smith):

• Vital Tech Tones (1998)
• VTT2 (2000)

Solo:

• Dog Party (1994)
• Tore Down House (1997)
• Well to the Bone (2002)
• Live! (2005)

Compilations:

• Tribal Tech: Primal Tracks (1994)
• Solo Albums: Collection (2007)

Other:

• Fables (Jean-Luc Ponty - 1985)
• Champion (Jeff Berlin - 1985)
• Chick Corea Elektric Band (Chick Corea - 1986)
• Players (1987, Jeff Berlin with T Lavitz and Steve Smith)
• The Immigrants (Zawinul Syndicate - 1988)
• Black Water (Zawinul Syndicate - 1989)
• Forbidden Zone (Tom Coster - 1994)
• Just Add Water - Virgil Donati, (1997)
• Crossroads (Jeff Berlin - 1999)
• Manic Voodoo Lady (Elvis Schoenberg and the Orchestre Surreal—2009)

Multimedia[link]

• ^{[dead link]}Scott Henderson Live At Big Mama - Italy (2001) (Real Video)
• ^{[dead link]}Tribal Tech Live At Big Mama - Italy (2000) (Real Video)
• ^{[dead link]}January 2006 Interview with Scott Kinsey and Scott Henderson for KCLA-FM's Meta Currents
• George Graham reviews Well To The Bone - WVIA-FM, Scranton/Wilkes-Barre, PA

External links[link]

• Scott Henderson's website
• ^{[dead link]}2005 Scott Henderson Interview
• 1999 Scott Henderson Interview
• European Jazz Network
• Scott Henderson Blues Band in concert 04-04-07, Utrecht (Holland)