Quartz

Quartz Varieties

Amethyst

Amethyst

Hardness: 7

Streak: White

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Aventurine

Aventurine

Hardness: ≈6.5 Approximate

Streak: White

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Chert

Chert

Hardness: 7

Streak: White

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Milky Quartz

Milky Quartz

Hardness: 7

Streak: White

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Rose Quartz

Rose Quartz

Hardness: 7

Streak: White

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Smoky Quartz

Smoky Quartz

Hardness: 7

Streak: White

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Tiger Eye

Tiger Eye

Hardness: 6.5–7

Streak: White

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Parent: Rocks & Minerals

Quartz (SiO₂) is a hard, abundant mineral found in igneous, metamorphic, and sedimentary rocks; it forms hexagonal crystals and occurs in many well‑known varieties.

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