igneous
Pegmatite
Coarse-grained intrusive igneous rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, pinkish-orange and green coloration, vitreous luster, interlocking coarse crystal structure, specific gravity around 2.5-2.7.
Identified More igneous →
Explore Pegmatite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6-7 on Mohs scale, pinkish-orange and green coloration, vitreous luster, interlocking coarse crystal structure, specific gravity around 2.5-2.7.
Formation & geological history
Formed from the slow crystallization of residual magma rich in water and rare elements deep within the Earth's crust.
Uses & applications
Source of rare-element minerals, gemstone mining, and sometimes crushed for specialized aggregate.
Geological facts
Pegmatites can host giant crystals measuring several meters long, including world-class tourmaline and spodumene specimens.
Field identification & locations
Identified by exceptionally large, interlocking crystals of feldspar, quartz, and accessory minerals. Common in continental shield regions.
