igneous
Pegmatitic granite
Quartz–feldspar–mica granite pegmatite
AI-generated identification · may be incorrectCoarse, unevenly sized crystals of pale quartz and feldspar with dark mica; typically Mohs 6–7, vitreous to pearly luster, and no overall cleavage. The specimen’s exact minerals cannot be confirmed from the image alone.
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Physical properties
Coarse, unevenly sized crystals of pale quartz and feldspar with dark mica; typically Mohs 6–7, vitreous to pearly luster, and no overall cleavage. The specimen’s exact minerals cannot be confirmed from the image alone.
Formation & geological history
Formed as very slowly cooling, silica-rich magma, commonly in veins near granitic intrusions; its age depends on the local geology and cannot be determined from appearance.
Uses & applications
Granite pegmatite is collected as a mineral specimen; associated quartz, feldspar, and mica may be used in construction, ceramics, glass, and electrical products.
Geological facts
Pegmatites can develop exceptionally large crystals and may host valuable minerals and gemstones, though none is clearly identifiable here.
Field identification & locations
Look for interlocking, visibly coarse light-colored crystals mixed with dark mica; common worldwide in and around granite bodies. A close-up or simple mineral tests would help distinguish pegmatite from ordinary coarse granite.
