igneous
Pegmatite
Igneous Pegmatite
AI-generated identification · may be incorrectExtremely coarse-grained with interlocking crystals; Mohs hardness varies by mineral (quartz is 7, feldspar is 6); vitreous to pearly luster; ranges in color from white and pink to grey.
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Physical properties
Extremely coarse-grained with interlocking crystals; Mohs hardness varies by mineral (quartz is 7, feldspar is 6); vitreous to pearly luster; ranges in color from white and pink to grey.
Formation & geological history
Formed from the slow crystallization of cooling magma rich in water and rare elements deep within the Earth's crust.
Uses & applications
A primary source for rare-earth elements, gemstones like tourmaline and beryl, and industrial minerals such as quartz and feldspar.
Geological facts
Pegmatites can host giant crystals measuring several meters long due to the high water content allowing rapid crystal growth.
Field identification & locations
Identify by exceptionally large, interlocking mineral crystals. Commonly found in major mountain belts and ancient cratons worldwide.
