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Brownish-black Grossular Garnet From Tanzania 74.5 gram 43x34x30 mm
Brownish-black Grossular Garnet (from Tanzania of Africa)
Description: Matrix specimen of sparkling, lustrous brownish-black Grossular crystals. Locality: Tanzania
Dimensions: 43x34x30 mm Weight: 74.5 gram
Grossular Garnet Grossular is member of the Garnet group, and is its most varicolored form, occurring in almost all colors except for blue. Grossular is often dark in color, but it also forms the lightest colored forms of Garnet, and can even be white or colorless. Although not as famous as Almandine and Pyrope, Grossular has some important gem varieties. These include the rare emerald-green Tsavorite and the orange to orange-brown Hessonite. Chemical Formula Ca3Al2Si3O12 Composition Calcium aluminum silicate, often with some iron, manganese, or chromium replacing some aluminum Color Brown, orange, green, yellow-green, and gray. Less often pink, red, and yellow. Rarely white, and colorless. Some massive specimens may be multicolored white, light green, and pink. Hardness 6.5 - 7.5 Crystal System Isometric Transparency Transparent to nearly opaque Luster Vitreous
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