igneous
Weathered granite or granitic pebble
Granite; primarily quartz, alkali feldspar, plagioclase, and mica
AI-generated identification · may be incorrectSmall rounded, coarse-grained specimen with mottled cream, gray, pink, and dark minerals; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, and no obvious cleavage as a whole rock. Exact identification is limited by the image.
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Physical properties
Small rounded, coarse-grained specimen with mottled cream, gray, pink, and dark minerals; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, and no obvious cleavage as a whole rock. Exact identification is limited by the image.
Formation & geological history
Granite forms when silica-rich magma slowly crystallizes deep in the continental crust, commonly during Precambrian to Phanerozoic mountain-building events; weathering and stream transport rounded this pebble.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and landscaping rock; this small specimen has mainly educational or collectible value.
Geological facts
The contrasting grains reflect different minerals crystallizing together, rather than a single crystal. Pink areas are commonly potassium feldspar, translucent grains quartz, and dark grains biotite or amphibole.
Field identification & locations
Identify it by visible interlocking grains, lack of layering or vesicles, and hardness sufficient to scratch glass; granite is common worldwide, especially in continental shields and mountain belts. A streak, acid, and close-magnification examination would improve certainty.
