Chert / Flint
rock · common
Quick facts
- Formula
- SiO2
- Hardness
- 6.5–7
- Luster
- Waxy to dull
- Colors
- Gray, tan, black, brown
Microcrystalline quartz rock. Conchoidal fracture. Flint is a dark variety historically used for tools.
Color alone cannot separate chert, jasper, and some agates. Fracture and translucency matter.
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