igneous
Tumbled granite pebble
Granite; primarily quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, pale gray-green and pink, with black mineral flecks; granular texture and dull-to-subvitreous luster. Hardness about 6–7 Mohs; no obvious cleavage as a whole rock; typical specific gravity 2.6–2.8.
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Physical properties
Coarse-grained, pale gray-green and pink, with black mineral flecks; granular texture and dull-to-subvitreous luster. Hardness about 6–7 Mohs; no obvious cleavage as a whole rock; typical specific gravity 2.6–2.8.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, commonly Precambrian to Phanerozoic in age. Its rounded shape and smooth surface result from stream or glacial abrasion, likely followed by tumbling.
Uses & applications
Used as aggregate, building stone, countertops, monuments, landscaping rock, and inexpensive polished collectibles; this small specimen has little gem value.
Geological facts
The pink areas are potassium feldspar, translucent grains are quartz, and dark flecks are commonly biotite or hornblende. Exact identification is limited because the specimen is wet and appears heavily rounded.
Field identification & locations
Identify granite by its visible interlocking light and dark grains, lack of layering, and inability to scratch easily with a steel knife. Common worldwide, especially in continental crust and mountain belts.
