igneous
Pegmatite with Copper Minerals
Coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectHardness 6-7 on the Mohs scale, composed of large interlocking crystals with distinct pale feldspar, quartz, and greenish-blue secondary copper mineral stains. Vitreous to pearly luster with uneven fracture.
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Physical properties
Hardness 6-7 on the Mohs scale, composed of large interlocking crystals with distinct pale feldspar, quartz, and greenish-blue secondary copper mineral stains. Vitreous to pearly luster with uneven fracture.
Formation & geological history
Formed from the slow cooling of water-rich magma deep within the Earth's crust during the final stages of crystallization, often Precambrian in age.
Uses & applications
Source of rare earth elements, gemstone crystals, and copper ore specimens valued by collectors.
Geological facts
Pegmatites host some of the largest individual crystals ever found on Earth, sometimes measuring many meters in length.
Field identification & locations
Identify in the field by extremely coarse crystal sizes and characteristic vibrant green or blue copper secondary coatings in fractured zones.
