Feldspar
A feldspar quarry in India
Feldspar is a very common igneous rock - more than half of the Earth's crust is made of feldspar. When molecules of aluminum, silica and oxygen get together with potassium, they combine to make the rock feldspar.
Feldspar often combines with quartz to make a much harder igneous rock called granite. Feldspar and pyroxene combine to make basalt.
When feldspar is in contact with wind or water, the wind and water gradually grind the feldspar down into tiny grains that become one kind of clay.
Feldspar
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