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Igneous rock: Basalt
Feldspar is a common mineral that occurs in igneous rocks such as Granite and metamorphic rocks. Feldspar belongs to the group of minerals called the aluminium-Tectosilicates. An estimated 60% of the Earth's crust consists of feldspars. Feldspar is divided into the Potassiumfeldspars containing Potassium, and Plagioclase containing Calcium.
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