igneous
Likely river-worn granite or granitic pebble
Granite (quartz + feldspar + mica), identification from the image is tentative
AI-generated identification · may be incorrectBrown-gray, rounded and weathered, with a fine-to-medium speckled texture and dull luster. Granite minerals are typically Mohs 6–7 (quartz) and 6 (feldspar); individual grains are too small to confirm crystal structure or cleavage here.
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Physical properties
Brown-gray, rounded and weathered, with a fine-to-medium speckled texture and dull luster. Granite minerals are typically Mohs 6–7 (quartz) and 6 (feldspar); individual grains are too small to confirm crystal structure or cleavage here.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in the crust; its age depends on source geology and cannot be determined from appearance. The rounded shape suggests abrasion during transport by water or glacial ice.
Uses & applications
Granite is widely used as building and paving stone, countertops, and aggregate; this small pebble is mainly suitable for collecting or decoration.
Geological facts
Granite is a rock composed chiefly of quartz and feldspar, with mica or other accessory minerals; surface staining and weathering can make it appear much browner than fresh granite.
Field identification & locations
Look for interlocking light and dark mineral grains and a hard, scratch-resistant surface; common in streams and glacial deposits near granite bedrock. The image does not show enough detail for a confident identification.
