igneous
Weathered granite-like pebble
Granite or granitic gneiss; mainly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse, mottled tan-brown and pink appearance with darker mineral patches; likely Mohs hardness 6–7, vitreous to dull luster, interlocking crystalline texture, and no obvious cleavage as a whole rock.
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Physical properties
Coarse, mottled tan-brown and pink appearance with darker mineral patches; likely Mohs hardness 6–7, vitreous to dull luster, interlocking crystalline texture, and no obvious cleavage as a whole rock.
Formation & geological history
Formed by slow cooling of silica-rich magma deep underground, probably hundreds of millions to billions of years ago, then exposed and rounded by weathering and transport.
Uses & applications
Used as aggregate, building stone, paving, and landscaping; attractive polished pieces may be sold as inexpensive curios or cabochon material.
Geological facts
The pink coloration commonly comes from potassium feldspar, while dark areas may be biotite or amphibole; surface staining and weathering can obscure the original texture.
Field identification & locations
Look for visible interlocking quartz and feldspar grains, pink or gray coloration, and scattered black mica; a hand lens and glass-scratch test help distinguish it from softer sedimentary rocks. Common worldwide, especially in continental mountain belts.
