SUPPORT US . It has a triclinic or monoclinic crystal system and a white streak, although the colour of the rock itself can be white, pink, grey, or brown. Its lustre is vitreous or glassy and it … Covid-19 has significantly affected our fundraising. Potassium Feldspar mineral data, information about Potassium Feldspar, its properties and worldwide locations. Formula: KAlSi 3 O 8 Monoclinic or Triclinic Description: Potassium feldspar refers to any of the three polymorphs microcline, orthoclase or sanidine. The group of minerals includes aluminum silicate of potassium, soda, or lime, and makes up approximately 41% of the Earth's continental crust by weight. It is sometimes impossible to tell apart one of these minerals from another without x-ray analysis. Potassium feldspar, also known as k-feldspar, is a silicate mineral with the chemical formula KAlSi308. They are all composed of the same elements, but their crystal structure differs. Microcline and orthoclase are potassium feldspars (KAlSi 3 O 8), usually designated Or in discussions involving their end-member composition.Albite (NaAlSi 3 O 8 —usually designated Ab) and anorthite (CaAl 2 Si 2 O 8 —An) are end-members of the plagioclase series. This has not kept the terms from being used freely in the literature without such analyses being made. Feldspars are a type of rock-forming minerals that contain silica and alumina. Group name for three very closely related minerals: Orthoclase, Sanidine, and Microcline.These three feldspar minerals have equal physical properties. In feldspar: Chemical composition. The minerals are found in abundance in metamorphic and igneous rock, as well as some forms of sedimentary rock.Feldspars can be divided into three … The distinction between these minerals can be made with certainty only after detailed X-Ray analysis. 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