igneous
Pegmatite with Tourmaline
Pegmatite / Silicate
AI-generated identification · may be incorrectHardness 6.5-7.5, color white and dark green-black, vitreous luster, coarse-grained crystal structure, specific gravity 2.6-2.7.
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Physical properties
Hardness 6.5-7.5, color white and dark green-black, vitreous luster, coarse-grained crystal structure, specific gravity 2.6-2.7.
Formation & geological history
Formed from the fractional crystallization of magma during the late stages of igneous rock formation.
Uses & applications
Used as a source of rare minerals, gemstone specimens, and mineral collecting.
Geological facts
Pegmatites can host exceptionally large mineral crystals and rare-element minerals like lithium and beryllium.
Field identification & locations
Identified by its extremely coarse-grained texture and sharp mineral contrast; found in major cratons worldwide.
