mineral
Feldspar
Potassium Feldspar (KAlSi3O8)
AI-generated identification · may be incorrectHardness: 6 (Mohs), Color: Pink, salmon, red, white, Luster: Vitreous to pearly, Crystal structure: Monoclinic or triclinic, Cleavage: Two directions at approximately 90 degrees
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Physical properties
Hardness: 6 (Mohs), Color: Pink, salmon, red, white, Luster: Vitreous to pearly, Crystal structure: Monoclinic or triclinic, Cleavage: Two directions at approximately 90 degrees
Formation & geological history
Formed in igneous and metamorphic rocks, often cooling from magma. Potassium feldspars are a major component of granite.
Uses & applications
Used extensively in the manufacturing of glass and ceramics. Also used as a mild abrasive and occasionally as a gemstone (e.g., moonstone, sunstone).
Geological facts
Feldspars are the most abundant group of minerals in the Earth's crust, making up about 60% of terrestrial rocks.
Field identification & locations
Identified by its pinkish color, hardness of 6 (scratches glass but not quartz), and prominent cleavage planes. Commonly found in granitic pegmatites.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous