Chert

Chert
Wikimedia Commons

Chert

Quartz

Hardness: 7

Streak: White

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AmethystAventurineMilky QuartzQuartz VarietiesRose QuartzSmoky Quartz

Chert is hard, microcrystalline quartz that breaks with conchoidal fracture; it occurs as nodules and layers, commonly in limestone and dolostone.

Parent: Quartz Varieties

Related: Amethyst, Aventurine, Milky Quartz, Quartz Varieties

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