igneous
Granite Pegmatite
Phaneritic Igneous Rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, predominantly pink and white with interlocking quartz, feldspar, and mica crystals. Exhibits a vitreous to pearly luster with no distinct cleavage planes.
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Physical properties
Hardness of 6-7 on Mohs scale, predominantly pink and white with interlocking quartz, feldspar, and mica crystals. Exhibits a vitreous to pearly luster with no distinct cleavage planes.
Formation & geological history
Formed from the slow crystallization of magma deep within the Earth's crust, typically during the final stages of magmatic crystallization.
Uses & applications
Used primarily in crushed stone for construction, architectural dimension stone, and as a source for rare element minerals.
Geological facts
Pegmatites are famous for containing exceptionally large crystals and rare minerals such as tourmaline, beryl, and lithium-bearing silicates.
Field identification & locations
Identified by its extremely coarse-grained texture with interlocking crystals larger than 2.5 cm. Commonly found in ancient cratons and mountain-building belts.
