igneous
Weathered granite or granitic gneiss pebble
Granite; primarily quartz, feldspar, and mica (exact identification is uncertain from the image)
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale tan-gray, granular texture, dull to slightly vitreous luster, and no obvious cleavage. The mottled appearance suggests interlocking quartz and feldspar grains, with possible dark mica or weathering stains.
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Physical properties
Hardness about 6–7 Mohs; pale tan-gray, granular texture, dull to slightly vitreous luster, and no obvious cleavage. The mottled appearance suggests interlocking quartz and feldspar grains, with possible dark mica or weathering stains.
Formation & geological history
Likely formed by slow crystallization of silica-rich magma deep underground, then exposed and rounded by weathering and transport. Granitic rocks are commonly Precambrian to Phanerozoic in age, depending on locality.
Uses & applications
Used as aggregate, building stone, monuments, countertops, and landscaping rock; this small weathered pebble has negligible commercial or jewelry value.
Geological facts
Granite’s visible grains indicate slow cooling beneath the surface. The rounded shape and softened surface are consistent with abrasion in a stream, beach, or glacial environment.
Field identification & locations
Look for a visibly granular texture, light feldspar/quartz, and scattered dark minerals; granite is harder than many sedimentary rocks and does not fizz with dilute acid. Common worldwide in continental crust and stream gravels.
