mineral
K-feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline or Orthoclase, KAlSi3O8)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, typically pink, salmon, or reddish-brown with vitreous to pearly luster. It exhibits two directions of cleavage at or near 90 degrees and belongs to the monoclinic or triclinic crystal system.
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Physical properties
Hardness of 6 on the Mohs scale, typically pink, salmon, or reddish-brown with vitreous to pearly luster. It exhibits two directions of cleavage at or near 90 degrees and belongs to the monoclinic or triclinic crystal system.
Formation & geological history
Formed through the slow cooling of silica-rich magma in intrusive igneous rocks like granite and syenite, as well as in pegmatites and metamorphic gneisses.
Uses & applications
Widely used in the manufacture of ceramics, porcelain, glass, and as a flux in metallurgy. It is also collected by mineral enthusiasts.
Geological facts
Feldspars are the most abundant mineral group in the Earth's crust, making up about 60% of the outer shell. The distinct pink color of potassium feldspar is often caused by microscopic hematite inclusions.
Field identification & locations
Identified in the field by its characteristic pinkish hue, blocky habit, and nearly right-angle cleavage planes. It is commonly found globally in granitic terrains and pegmatite dikes.
