Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica SiO2 in their chemistry This group includes aluminium silicates of soda potassium or lime It is the single most abundant mineral group on Earth
They account for an estimated 60 of exposed rocks as well as soils clays and other unconsolidated sediments and are principal components in rock classification schemes The minerals included in this group are the orthoclase microcline and plagioclase feldspars
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