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Stibiotantalite is primarily used as a gemstone. [4] These gems are vivid, shiny, and golden-brown. These gems come between 0.73 carats and 6.34 carats, with the average being 3.54. These gems are similar in appearance to sphalerite, but they are brown instead of orange. While stibiotantalite and tantalite are similar, stibiotantalite is softer ...
Russellite is a bismuth tungstate mineral with the chemical formula Bi 2 WO 6. [2] It crystallizes in the orthorhombic crystal system.Russellite is yellow or yellow-green in color, with a Mohs hardness of 3 + 1 ⁄ 2.
Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.
Pyramidal (mm2) (same H-M symbol) Space group: Pc2 1 b: Unit cell: a = 5.582 Å, b = 5.582 Å, c = 5.582 Å; Z = 4: Identification; Color: Reddish silver white, violet steel gray to black: Crystal habit: Granular to massive, rarely as striated crystals, pseudocubic. Twinning: About [111] creating pseudo-cubic forms and striations: Cleavage ...
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to ...
In crystallography, the orthorhombic crystal system is one of the 7 crystal systems.Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a rectangular base (a by b) and height (c), such that a, b, and c are distinct.
Bertrandite is a beryllium sorosilicate hydroxide mineral with composition: Be 4 Si 2 O 7 (OH) 2.Bertrandite is a colorless to pale yellow orthorhombic mineral with a hardness of 6–7.
Boracite is a magnesium borate mineral with formula: Mg 3 B 7 O 13 Cl.It occurs as blue green, colorless, gray, yellow to white crystals in the orthorhombic - pyramidal crystal system.