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Chert
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Chert is a cryptocrystalline form of quartz that forms as modules and layers within other sedimentary rocks such as dolomite, limestone and chalk. Chert is a sedimentary rock although it is often referred to as a mineral. You can find chert samples worldwide and as a material for prehistoric arrowheads and tools as well as headstones and as a component in firearms.
WARNING: CHOKING HAZARD - Small Parts. Not for Children Under 3 years.