igneous
Granite Pegmatite
Pegmatite
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, coarse-grained texture with large crystals, variable color including pink, grey, and white, vitreous luster.
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Physical properties
Hardness 6-7 on Mohs scale, coarse-grained texture with large crystals, variable color including pink, grey, and white, vitreous luster.
Formation & geological history
Formed from the slow crystallization of magma deep within the Earth's crust, often enriched in rare elements and water.
Uses & applications
Source of rare earth elements, gemstone mining, and occasionally used as decorative dimension stone.
Geological facts
Pegmatites can contain exceptionally large crystals, sometimes measuring several meters in length.
Field identification & locations
Identify by exceptionally large interlocking crystals of quartz, feldspar, and mica. Found worldwide in ancient cratons.
