Feldspar Feldspar any of a group of aluminosilicate minerals that contain calcium sodium or potassium Feldspars make up more than half of Earth 39 s crust and
Feldspars are a group of rock forming tectosilicate minerals that make up about 41 of the Earth 39 s continental crust by weight
Over half the Earth 39 s crust is composed of a single group of minerals known as the feldspars Feldspars are an important component of many building stones but
Feldspar minerals occur in igneous metamorphic and sedimentary rocks throughout The alkali feldspars form a solid solution series between pure albite and Two specimens of labradorite feldspar that have been cut into faceted stones
Jan 9 2019 For rockhounds without laboratories it 39 s enough to be able to tell the two main types of feldspar plagioclase PLADGE yo clays feldspar and
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