igneous
Uncertain rounded gray stone
Possibly granite, gneiss, or a glacially transported granitoid
AI-generated identification · may be incorrectSmall rounded pebble with mottled gray–white and dark grains, probably granular and nonmetallic; likely Mohs 6–7, with glassy to dull luster and no obvious cleavage. The blurred image prevents reliable mineral identification.
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Physical properties
Small rounded pebble with mottled gray–white and dark grains, probably granular and nonmetallic; likely Mohs 6–7, with glassy to dull luster and no obvious cleavage. The blurred image prevents reliable mineral identification.
Formation & geological history
Likely weathered and rounded by glacial or stream transport; granitoid rocks in northeastern Minnesota commonly formed roughly 1.8–2.7 billion years ago. Exact age and formation cannot be determined visually.
Uses & applications
Primarily a natural specimen or landscaping stone; unremarkable pebbles have little commercial or jewelry value.
Geological facts
The reported location near 46.7°N, 92.0°W is consistent with abundant glacially transported granite, gneiss, basalt, and related Precambrian rocks.
Field identification & locations
Look for interlocking visible quartz (gray/glassy), feldspar (white/pink), and black biotite or amphibole to confirm granite; streak, hardness, and a fresh broken surface help distinguish it from concrete. A magnet test may detect magnetite but is not diagnostic.
