181) Ĭolorless through various colors (pink, orange, purple, dark brown) to blackĦ-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massiveĬommon Dauphine law, Brazil law, and Japan lawħ – lower in impure varieties (defining mineral)Ģ.65 variable 2.59–2.63 in impure varietiesġ670 ☌ (β tridymite) 1713 ☌ (β cristobalite)
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