banded aralite containing silicon carbide
5
Coin
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Acid salt minerals. The composition is CaCO3. Also known as aragonite, and calcite into a homogeneous multi-like. The orthorhombic crystal system, the crystal is columnar or spear-shaped, common false hexagonal symmetry of the three-linked crystal. The aggregate is mostly shell-like, oolitic, bean-like, spherical, etc. Usually white, yellow-white. Glass luster, the fracture is grease luster. with incomplete plate cleavage. Shell-shaped fracture. Mohs hardness 3.5~4.5. Specific gravity 2.9~3.0. In the nature of the unstable arangite, often transformed into calcite. Silicon carbide is a semiconductor that occurs in nature in the form of the extremely rare mineral moissanite.
