igneous
Granite Pegmatite
Phaneritic Igneous Rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale; composed of interlocking quartz, feldspar, and mica crystals showing a very coarse-grained texture.
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Physical properties
Hardness of 6-7 on Mohs scale; composed of interlocking quartz, feldspar, and mica crystals showing a very coarse-grained texture.
Formation & geological history
Formed from the slow cooling of water-rich magma deep within the Earth's crust, typically during the final stages of magma crystallization.
Uses & applications
Used as a decorative dimension stone, in high-end countertops, and as a primary source for rare minerals and gem-quality crystals.
Geological facts
Pegmatites can contain exceptionally large crystals, sometimes growing to several meters in length, and often host rare-earth elements.
Field identification & locations
Identified by its extremely large, interlocking mineral crystals; commonly found in ancient continental shields and mountain-building belts.
