igneous
Pegmatite
Igneous Pegmatite
AI-generated identification · may be incorrectMohs hardness typically 6-7 depending on mineral content; exhibits very large crystal sizes, variable colors ranging from white to pink and gray, and vitreous to pearly luster.
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Physical properties
Mohs hardness typically 6-7 depending on mineral content; exhibits very large crystal sizes, variable colors ranging from white to pink and gray, and vitreous to pearly luster.
Formation & geological history
Formed from the slow crystallization of residual magmas rich in water and rare elements, often during the final stages of magmatic crystallization.
Uses & applications
Source of rare earth elements, industrial minerals like feldspar and mica, and gem-quality crystals such as tourmaline and beryl.
Geological facts
Pegmatites can host some of the largest known individual crystals in the geological record, measuring many meters in length.
Field identification & locations
Identify by exceptionally large interlocking crystals of quartz, feldspar, and mica. Commonly found in association with large batholiths and continental crust.
