mineral
Feldspar
Tectosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, typically white, gray, or pinkish with a vitreous to pearly luster. It exhibits two directions of perfect cleavage intersecting at approximately 90 degrees.
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Physical properties
Hardness of 6 on the Mohs scale, typically white, gray, or pinkish with a vitreous to pearly luster. It exhibits two directions of perfect cleavage intersecting at approximately 90 degrees.
Formation & geological history
Forms primarily through the crystallization of magma in igneous rocks like granite, and also crystallizes in metamorphic and sedimentary environments.
Uses & applications
Widely used in the manufacture of glass, ceramics, pottery glazes, and as a flux in metallurgy.
Geological facts
Feldspar is the single most abundant mineral group in the Earth's crust, making up about 60% of terrestrial rocks.
Field identification & locations
Identified by its blocky crystal habit, 90-degree cleavage planes, and hardness that scratches glass. Commonly found worldwide in pegmatites and granitic terrains.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic