Group name for three very closely related minerals: Orthoclase, Sanidine, and Microcline.These three feldspar minerals have equal physical properties. 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. Potassium feldspar, also known as k-feldspar, is a silicate mineral with the chemical formula KAlSi308. Potassium Feldspar mineral data, information about Potassium Feldspar, its properties and worldwide locations. 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 … 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. Formula: KAlSi 3 O 8 Monoclinic or Triclinic Description: Potassium feldspar refers to any of the three polymorphs microcline, orthoclase or sanidine. Its lustre is vitreous or glassy and it … Feldspars are a type of rock-forming minerals that contain silica and alumina. In feldspar: Chemical composition. Covid-19 has significantly affected our fundraising. This has not kept the terms from being used freely in the literature without such analyses being made. SUPPORT US . It is sometimes impossible to tell apart one of these minerals from another without x-ray analysis. 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. The distinction between these minerals can be made with certainty only after detailed X-Ray analysis.
2020 potassium feldspar mineral