Basalt is a very hard rock too. Potassium feldspar, also known as k-feldspar, is a silicate mineral with the chemical formula KAlSi308. 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 … Potassium Feldspar mineral data, information about Potassium Feldspar, its properties and worldwide locations. Potassium feldspar is an important component of most felsic igneous rocks, pegmatites, low temperature hydrothermal veins and many metamorphic rocks. SUPPORT US . Potassium feldspar also occurs in felsic igneous rocks in the Upper Midwest. The top states in the U.S. producing feldspar are North Carolina, Virginia, California, Oklahoma, Idaho, Georgia, and South Dakota in that chronological order. Or, if feldspar gets in contact with another rock called pyroxene, those two rocks combine to make basalt. “Feldspar” is the name of a large group of rock-forming silicate minerals that make up over 50% of Earth’s crust. Feldspar minerals have very similar structures, … Potassium Feldspar . Potassium feldspar or "K-feldspar" varies in crystal structure depending on its crystallization temperature. Since the Stone Age, people have used basalt for grindstones. Microcline is the stable form of potassium feldspar below about 400° C. Orthoclase and sanidine are stable above 500° C and 900° C, respectively, but they endure as long as they need to at the surface as metastable species. Feldspar and pyroxene make basalt. One of the earliest trade goods was basalt for grindstones, carried down rivers or on donkeys. What is Feldspar? More about basalt Covid-19 has significantly affected our fundraising. 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