igneous
Rounded gray pebble, likely granite or granitic gneiss
Probable granitic rock, composed mainly of quartz, feldspar, and dark mica or amphibole; exact identification is not possible from the image alone.
AI-generated identification · may be incorrectGray, coarse-speckled, and water-worn with a dull to slightly sparkly surface. The constituent minerals are typically Mohs 6–7 for quartz and feldspar; the rock has no single crystal structure or cleavage.
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Physical properties
Gray, coarse-speckled, and water-worn with a dull to slightly sparkly surface. The constituent minerals are typically Mohs 6–7 for quartz and feldspar; the rock has no single crystal structure or cleavage.
Formation & geological history
Likely formed when silica-rich magma cooled slowly underground, then was exposed and rounded by water or glacial transport. Its age cannot be determined from appearance alone; granitic rocks range from ancient to geologically recent.
Uses & applications
Comparable material is used as crushed aggregate, paving, and dimension stone; this small pebble is mainly suitable for collecting or landscaping.
Geological facts
The contrasting flecks are likely interlocking mineral grains rather than paint or coating.
Field identification & locations
Look for visible light quartz and feldspar with darker mica or amphibole, plus a uniformly hard, granular texture. Similar pebbles occur in stream, beach, and glacial deposits worldwide.
