igneous
Granitic Pegmatite
Pegmatite
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, coarse-grained texture with very large crystals, variable color including pink, white, and black, vitreous luster.
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Physical properties
Hardness of 6-7 on Mohs scale, coarse-grained texture with very large crystals, variable color including pink, white, and black, vitreous luster.
Formation & geological history
Formed from the extreme fractional crystallization of cooling magma deep within the Earth's crust, often containing rare minerals.
Uses & applications
Source of rare elements, industrial minerals, and gem-quality crystals such as tourmaline, beryl, and spodumene.
Geological facts
Pegmatites can host single crystals measuring several meters in length, representing some of the largest crystal growths in nature.
Field identification & locations
Identify by exceptionally large, interlocking mineral grains, often found cutting through surrounding host rock in dikes or sills.
