
sedimentary
Chert
Chert is a hard, fine-grained sedimentary rock made mostly of microcrystalline quartz. It has been used for tools and construction throughout history.
Hardness 6.5–7India
Showing all stones commonly used for construction aggregate
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sedimentary
Chert is a hard, fine-grained sedimentary rock made mostly of microcrystalline quartz. It has been used for tools and construction throughout history.

sedimentary
Conglomerate is a coarse-grained sedimentary rock made of rounded clasts bound by a matrix. It forms in high-energy environments like rivers.

extrusive
Rhyolite is a light-colored, fine-grained extrusive igneous rock, chemically similar to granite.

extrusive
Scoria is a dark, porous volcanic rock formed from basaltic magma, notable for its vesicular texture and lightweight nature.