Dolomite is the mineral CaMg(CO3)2 - calcium magnesium carbonate. It is also used as a name for a rock containing more than 15% magnesium carbonate. It forms from the alteration of limestones or as an evaporite (a rock which forms when a body of water is evaporated and the salts contained in the water are precipitated out).
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Lower rotating mass quicker handling. Lower profile more pronounced coning effect when leaned over sharper handling. Smaller wheel/tire less unsprung weight better traction over bumpy surfaces more control. Watch Moto GP racing and notice riders like Rossi and Hayden come out of a corner hard on the gas, still leaning the bike, and the front wheel OFF THE GROUND!
Dolomite From pedia, the free encyclopedia Jump to: navigation, search This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (August 2007) For other uses, see Dolomite (disambiguation). Dolomite General Category Carbonate mineral Chemical formula CaMg(CO3)2 Identification Color white, gray to pink Crystal habit tabular crystals, often with curved faces, also columnar, stalactitic, granular, massive. Crystal system trigonal - rhombohedral, bar3 Twinning common as simple contact twins Cleavage rhombohedral cleavage (3 planes) Fracture brittle - conchoidal Mohs Scale hardness 3.5 to 4 Luster vitreous to pearly Refractive index nω 1.679 - 1.681 nε 1.500 Optical Properties Uniaxial (-) Birefringence δ 0.179 - 0.181 Streak white Specific gravity 2.84 - 2.86 Solubility Poorly soluble in dilute HCl unless powdered. Other Characteristics May fluoresce white to pink under UV; triboluminescent. References [1][2][3][4] Dolomite from Morocco. Dolomite from Morocco. Dolomite. Dolomite. Dolomite (pronounced /?d?l?ma?t/) is the name of a sedimentary carbonate rock and a mineral, both composed of calcium magnesium carbonate CaMg(CO3)2 found in crystals. Dolomite rock (also dolostone) is composed predominantly of the mineral dolomite. 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 the rock by the French naturalist and geologist, Déodat Gratet de Dolomieu (1750-1801) for exposures in the Dolomite Alps of northern Italy.
* Chemistry: CaMg(CO3)2, Calcium Magnesium Carbonate * Class: Carbonates * Group: Dolomite * Uses: in some cements, as a source of magnesium and as mineral specimens. * Specimens * Color is often pink or pinkish and can be colorless, white, yellow, gray or even brown or black when iron is present in the crystal. * Luster is pearly to vitreous to dull. * Transparency crystals are transparent to translucent. * Crystal System is trigonal; bar 3 * Crystal Habits include saddle shaped rhombohedral twins and simple rhombs some with slightly curved faces, also prismatic, massive, granular and rock forming. Never found in scalenohedrons. * Cleavage is perfect in three directions forming rhombohedrons. * Fracture is conchoidal. * Hardness is 3.5-4 * Specific Gravity is 2.86 (average) * Streak is white. * Other Characteristics: Unlike calcite, effervesces weakly with warm acid or when first powdered with cold HCl. * Associated Minerals: include calcite, sulfide ore minerals, fluorite, barite, quartz and occasionally with gold. * Notable Occurrences include many localities throughout the world, but well known from sites in Midwestern quarries of the USA; Ontario, Canada; Switzerland; Pamplona, Spain and in Mexico. * Best Field Indicators are typical pink color, crystal habit, hardness, slow reaction to acid, density and luster.
