Alkali feldspar granite some varieties of which are called 39 red granite 39 is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar
Feldspars are a group of rock forming tectosilicate minerals that make up about 41 of the Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite Feldspars are also found in many types of sedimentary rocks
Feldspar Chemical composition All the rock forming feldspars are aluminosilicate minerals with the general formula AT4O8 in which A potassium sodium
The igneous rocks basalt extrusive and gabbro intrusive contain feldspar that is almost exclusively plagioclase True granite contains both alkali and
Learn more about the properties and uses of feldspar in this article any of a group of aluminosilicate minerals that contain calcium sodium or potassium Each of the common rock forming minerals can be identified on the basis of its
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