2010年5月18日星期二

What is the Milky Way Stone

What is dolomite

A kind of mineral calcium magnesium carbonate. Often iron, manganese, sometimes zinc, nickel and cobalt mixed. Three crystals. Crystal often has rhombohedral shape, and the crystal surface due to bending was saddle. Dense aggregate block of soft, granular kidney formation. Generally gray; sometimes were yellowish, slightly brown, light green; minority also a variety of Chromic, such as the Czech production has a cobalt (coco3 up to 7.5%) of dolomite was red. Transparency - micro transparent. Glass - pearl luster. A negative crystal axis. Refractive index no = 1.679 ~ 1.703, ne = 1.500 ~ 1.520; re-discount rate of 0.179 ~ 0.185. Strong dispersion. Hardness 3.5 to 4. Three diamond cleavage completely, but most of the cleavage plane bending, the relative density of 2.8 ~ 2.9. Case of hydrochloric acid is less than sparkling calcite decomposition. Dolomite and calcite, just as important rock-forming minerals, and mainly for the exogenous causes of the lagoon basin sediments. In the early Earth environment, the sedimentary origin of dolomite rather than limestone.

What is the Milky Way Stone

Tian Shi, also called "Amazon stone", the English Amazonite the paraphrase. Blue and blue-green, translucent to slightly transparent. Do ring surface or sculpture. Color is pure blue, emerald. Bright texture, transparency, and less for the quality product of cleavage. Tianhe emerald jade stone can be used as a substitute.

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