igneous
Pegmatite
Pegmatite (Coarse-grained igneous rock)
AI-generated identification · may be incorrectHardness varies from 6 to 7 on the Mohs scale depending on mineral content. Features exceptionally large crystals, often containing quartz, feldspar, and mica.
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Physical properties
Hardness varies from 6 to 7 on the Mohs scale depending on mineral content. Features exceptionally large crystals, often containing quartz, feldspar, and mica.
Formation & geological history
Formed from the cooling of water-rich magma during the final stages of magmatic crystallization, often millions of years ago.
Uses & applications
Source of rare earth elements, industrial minerals, and rare gem-quality crystals like tourmaline, beryl, and spodumene.
Geological facts
Pegmatites can host some of the largest individual crystals ever found on Earth, sometimes measuring several meters in length.
Field identification & locations
Identified easily by its extremely coarse, interlocking crystal texture and presence of giant feldspar or quartz crystals. Found globally in ancient crustal shields.
