mineral
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, typically white, gray, or pink, with a vitreous to pearly luster and good cleavage in two directions at right angles.
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Physical properties
Hardness of 6 on the Mohs scale, typically white, gray, or pink, with a vitreous to pearly luster and good cleavage in two directions at right angles.
Formation & geological history
Formed through the cooling of magma or lava in igneous and metamorphic rocks, making up over 60% of Earth's crust.
Uses & applications
Widely used in the manufacture of glass, ceramics, porcelain, and as a flux in metallurgy.
Geological facts
Feldspar is the most abundant mineral group in the Earth's continental crust and weathers to form clay minerals.
Field identification & locations
Identified by its rectangular crystal habit, two cleavage planes at roughly 90 degrees, and lack of effervescence with acid.
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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