igneous
Pegmatite
Coarse-grained igneous rock
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, varied colors including pink, white, and black, vitreous luster, coarse crystal structure with large crystals.
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Physical properties
Hardness 6-7 on Mohs scale, varied colors including pink, white, and black, vitreous luster, coarse crystal structure with large crystals.
Formation & geological history
Formed from cooling magma rich in water and other volatiles during the final stages of magmatic crystallization.
Uses & applications
Source of rare earth elements, gemstones, and industrial minerals like feldspar and quartz.
Geological facts
Pegmatites can host some of the largest individual crystals ever found, sometimes measuring several meters in length.
Field identification & locations
Identify by exceptionally large interlocking mineral grains, commonly found intersecting larger plutons or in crustal orogens.
