Chalcedony

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Chalcedony

Quartz

Hardness: 6.5–7

Streak: White

...

AgateColdwater AgateFire AgateHeliotrope (Bloodstone)Lake Superior AgateMoss Agate

Chalcedony is microcrystalline quartz that includes agate, jasper, onyx, and related varieties; it typically forms from silica‑rich fluids filling cavities and fractures.

Parent: Quartz

Related: Agate, Coldwater Agate, Fire Agate, Heliotrope (Bloodstone)

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