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Macrocrystalline varieties: Milky: white,Smokey: gray, Amethyst: violet, Rose: pink
Six-sided prismatic crystals terminated by six-sided triangular faces, often striated crosswise; conchoidal fracture; vitreous to /cc; brittle tenacity; waxy luster; H 7;den = 2.65g silicate; use rock former.
Cryptocrystalline varieties: Chert: light color, Flint: dark color, Jasper: red, Agate: banded
Conchoidal fracture; dull or clouded luster; H = 7; den = 2.65g/cc; silicate; use: rock former, jewelry.
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