mineral
Feldspar (Microcline / Orthoclase)
Potassium Feldspar (KAlSi3O8)
AI-generated identification · may be incorrectHardness 6 on Mohs scale; pale white to cream color; vitreous to pearly luster; exhibits two planes of cleavage at nearly 90 degrees.
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Physical properties
Hardness 6 on Mohs scale; pale white to cream color; vitreous to pearly luster; exhibits two planes of cleavage at nearly 90 degrees.
Formation & geological history
Crystallizes in felsic igneous rocks, particularly granites and pegmatites, as well as high-grade metamorphic rocks.
Uses & applications
Extensively used in ceramic and glass manufacturing, as an abrasive, and occasionally as a minor gemstone or mineral specimen.
Geological facts
Feldspar group minerals make up over 50% of Earth's continental crust.
Field identification & locations
Identified by blocky cleavage, moderate hardness (scratches glass), and light coloration; found globally in pegmatite zones.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
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
Septarian Pebble
Septarian nodule / Concretion
sedimentary