igneous
Pegmatitic granite (likely quartz–feldspar-rich rock)
Granitic pegmatite; chiefly quartz (SiO₂), feldspars, and mica
AI-generated identification · may be incorrectCoarse, irregular intergrowths of pale quartz and feldspar with pinkish areas and possible mica; visible grains suggest a crystalline texture. Quartz is Mohs 7, feldspar 6, and mica about 2–3; exact luster and composition are difficult to confirm from the photo.
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Physical properties
Coarse, irregular intergrowths of pale quartz and feldspar with pinkish areas and possible mica; visible grains suggest a crystalline texture. Quartz is Mohs 7, feldspar 6, and mica about 2–3; exact luster and composition are difficult to confirm from the photo.
Formation & geological history
Likely crystallized from silica-rich magma, with slow cooling that allowed large crystals to grow. Pegmatites commonly formed during late stages of Precambrian or younger granitic intrusions; age cannot be determined visually.
Uses & applications
Pegmatite may be collected for its coarse crystals and can host feldspar, quartz, mica, and minerals such as lithium-bearing spodumene. This specimen appears mainly of collector interest rather than suitable as a gem or building stone.
Geological facts
Pegmatites are notable for exceptionally large crystals and can contain rare-element minerals; the pictured rock’s exact mineral assemblage is not identifiable from the image alone.
Field identification & locations
Look for interlocking, conspicuously coarse quartz and feldspar, often with mica; common in granitic terrains worldwide. A fresh surface and simple hardness or streak tests can help distinguish minerals.
