Rocks

Rock types

AndesiteAndesite

Andesite

Andesite is an extrusive igneous rock. It is usually formed where two tectonic plates are pushing towards each other (a convergent plate boundary). Andesite is brown or grey and composed mostly of feldspar minerals plus hornblende or biotite.



AnthraciteAnthracite

Anthracite

The most common sedimentary rock is shale, which is formed from tiny particles of materials such as quartz, feldspar and clay minerals.

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