Rocks for Construction Aggregate

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

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