igneous
Pegmatitic granite
Granite, composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray to pinkish rock with interlocking crystals, glassy gray quartz, light feldspar, and dark mica/hornblende; hardness about 6–7 Mohs, nonfoliated, with poor or absent cleavage as a whole.
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Physical properties
Coarse-grained, pale gray to pinkish rock with interlocking crystals, glassy gray quartz, light feldspar, and dark mica/hornblende; hardness about 6–7 Mohs, nonfoliated, with poor or absent cleavage as a whole.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma cooled slowly deep underground, allowing large crystals to grow; its exact geological age cannot be determined from the image and varies by locality.
Uses & applications
Used as building stone, countertops, monuments, aggregate, and decorative specimens; ordinary pieces have little jewelry value.
Geological facts
The large visible crystals suggest a pegmatitic or coarse-grained variety. Dark flakes may be biotite mica, while rusty patches commonly represent weathered iron-bearing minerals.
Field identification & locations
Identify it by its interlocking quartz-feldspar-mica texture and lack of layering or fossils; it commonly occurs in continental plutons, granite batholiths, and pegmatite zones worldwide.
