igneous
Likely weathered quartz-rich rock fragment
Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock
AI-generated identification · may be incorrectSmall, irregular tan-gray fragment with a dull to slightly granular luster and apparent light-colored quartz/feldspar grains. Hardness likely about 6–7 Mohs; cleavage and specific gravity cannot be reliably determined from the image.
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Physical properties
Small, irregular tan-gray fragment with a dull to slightly granular luster and apparent light-colored quartz/feldspar grains. Hardness likely about 6–7 Mohs; cleavage and specific gravity cannot be reliably determined from the image.
Formation & geological history
Could be a weathered glacial erratic or locally derived fragment. Around 46.7°N, 92.0°W, glacial deposits commonly contain granite, gneiss, basalt, and other Precambrian rocks, generally hundreds of millions to billions of years old.
Uses & applications
No significant commercial use at this size; comparable intact material may be used as aggregate, building stone, or lapidary rough.
Geological facts
The image is too dim and low-scale for a confident mineral identification; the dark patch may be staining, a mafic grain, or shadow rather than a distinct mineral.
Field identification & locations
Check a fresh broken surface: quartz is glassy and lacks cleavage, feldspar is commonly white/pink with cleavage, and mica splits into thin sheets. A streak test, hardness test, and brighter close-up would greatly improve identification.
