mineral
Feldspar
Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, colors range from white and grey to pink and reddish-brown, vitreous to pearly luster, and distinct cleavage in two directions at nearly 90 degrees.
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Physical properties
Hardness of 6 on the Mohs scale, colors range from white and grey to pink and reddish-brown, vitreous to pearly luster, and distinct cleavage in two directions at nearly 90 degrees.
Formation & geological history
Forms major components of igneous, metamorphic, and sedimentary rocks through crystallization from magma or high-temperature hydrothermal processes.
Uses & applications
Widely used in the manufacture of glass, ceramics, porcelain, and as flux in metallurgy.
Geological facts
Feldspar is the single most common mineral group in the Earth's crust, making up about 41% of it.
Field identification & locations
Identified by its rectangular crystal habit, good cleavage, and characteristic hardness; found globally in granites and pegmatites.
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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