igneous
Granite Pegmatite
Felsic intrusive igneous rock
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, coarse-grained texture, vitreous to dull luster, and composed mainly of quartz, alkali feldspar, and biotite.
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Physical properties
Hardness of 6-7 on the Mohs scale, coarse-grained texture, vitreous to dull luster, and composed mainly of quartz, alkali feldspar, and biotite.
Formation & geological history
Formed from the slow cooling of magma rich in water and incompatible elements deep within the Earth's crust.
Uses & applications
Utilized as crushed stone in construction, dimension stone for architecture, and as a source of rare minerals for industrial applications.
Geological facts
Pegmatites can host exceptionally large crystals, sometimes growing to several meters in length, and are primary sources of rare earth elements and gemstones.
Field identification & locations
Easily identified in the field by its extremely large, interlocking mineral crystals. Commonly found in ancient shield areas and mountain-building belts.
