igneous
Granite pebble
Granite, a quartz–feldspar–mica plutonic rock
AI-generated identification · may be incorrectFine- to medium-grained, gray-pink with scattered sparkly mineral grains; likely quartz, feldspars, and mica. Quartz is Mohs 7, feldspar about 6; granite has no single crystal structure or cleavage, and typical specific gravity is 2.6–2.7.
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Physical properties
Fine- to medium-grained, gray-pink with scattered sparkly mineral grains; likely quartz, feldspars, and mica. Quartz is Mohs 7, feldspar about 6; granite has no single crystal structure or cleavage, and typical specific gravity is 2.6–2.7.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing crystals to grow. The pebble’s geological age cannot be determined from the photo; granite bodies range from ancient to geologically recent.
Uses & applications
Granite is widely used for building stone, countertops, paving, and decorative aggregates; small pebbles are commonly collected or used in crafts.
Geological facts
The rounded shape and smooth surface suggest water or abrasion during transport, but the image alone cannot confirm granite rather than a similar granular rock.
Field identification & locations
Look for interlocking grains, including translucent or glassy quartz, feldspar, and dark mica. Granite is common in continental crust worldwide; a hand lens can help verify its mineral grains.
