igneous
Pegmatite
Granitic Pegmatite
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, coarse-grained texture with exceptionally large crystals, vitreous to pearly luster, specific gravity around 2.6-2.7.
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Physical properties
Hardness 6-7 on Mohs scale, coarse-grained texture with exceptionally large crystals, vitreous to pearly luster, specific gravity around 2.6-2.7.
Formation & geological history
Formed from the slow-cooling water-rich residual melts of magma chambers deep within the Earth's crust.
Uses & applications
Source of rare earth elements, industrial minerals like quartz and feldspar, and gem-quality crystals.
Geological facts
Pegmatites can host crystals over several meters in length, representing some of the largest crystal growths on Earth.
Field identification & locations
Identified by its extremely large interlocking mineral crystals, often found near large granitic plutons worldwide.
