Chemical composition -- Silicon dioxide.
Quartz is one of the most abundant minerals on Earth and is found in many different forms almost everywhere. There are two major classifications of quartz: crystalline quartz and cryptocrystalline quartz.
Color -- Very wide color range -- colorless, yellow, brown, purple, pink, greenish. Cryptocrystalline quartz often displays exotic color bands, swirls, and other patterns.
Optics -- R.I. 1.553-1.554. Uniaxial positive.
Durability -- Hardness 7.
Crystal structure -- Hexagonal.
Specific Gravity -- 2.651 for crystalline material, up to 2.91 for cryptocrystalline.
Sources -- Extremely widespread.
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