igneous
Weathered granite pebble
Granite, predominantly quartz–feldspar–mica; exact variety indeterminate from the photo
AI-generated identification · may be incorrectCoarse-grained, pale gray to pink rock with visible granular texture and scattered dark mica; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no cleavage as a whole. Rounded edges indicate natural abrasion or tumbling/weathering.
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Physical properties
Coarse-grained, pale gray to pink rock with visible granular texture and scattered dark mica; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no cleavage as a whole. Rounded edges indicate natural abrasion or tumbling/weathering.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic intrusive events; this pebble was later exposed, eroded, and rounded by water or transport.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, landscaping rock, and decorative pebbles; this small specimen has modest educational or collecting value.
Geological facts
The pale grains are likely quartz and feldspar, while darker flecks are biotite or hornblende; rusty patches may reflect oxidation of iron-bearing minerals.
Field identification & locations
Identify it by its speckled interlocking crystals, hardness, and inability to scratch easily with a steel knife; common worldwide in areas underlain by granitic bedrock and stream gravels. A precise identification would require a fresh surface or thin section.
