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
Rocks for Construction Aggregate
Showing all stones commonly used for construction aggregate
Use: construction aggregate
4 stones found
Stone Wiki
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sedimentary
Conglomerate
Conglomerate is a coarse-grained sedimentary rock made of rounded clasts bound by a matrix. It forms in high-energy environments like rivers.
India
extrusive
Rhyolite
Rhyolite is a light-colored, fine-grained extrusive igneous rock, chemically similar to granite.
Hardness 6–7USA
extrusive
Scoria
Scoria is a dark, porous volcanic rock formed from basaltic magma, notable for its vesicular texture and lightweight nature.
Italy