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Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspar crystallize from magma in both intrusive and extrusive igneous rocks, and they can also occur as compact minerals.
Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspar crystallize from magma in both intrusive and extrusive igneous rocks, and they can also occur as compact minerals, as veins, and are also present in many types of metamorphic rock.