igneous
Granite or granitic gneiss fragment
Granite; primarily quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, gray-green and speckled, with a granular texture and dull to slightly vitreous luster. Typical hardness is about 6–7 Mohs; crystals show no prominent cleavage as a whole, though feldspar and mica do.
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Physical properties
Coarse-grained, gray-green and speckled, with a granular texture and dull to slightly vitreous luster. Typical hardness is about 6–7 Mohs; crystals show no prominent cleavage as a whole, though feldspar and mica do.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to younger continental mountain-building events; foliation, if present, could indicate metamorphosed granite (gneiss).
Uses & applications
Used as dimension stone, aggregate, paving material, monuments, and landscaping rock; small natural fragments have little commercial or jewelry value.
Geological facts
The visible interlocking grains and light-dark mineral mixture are characteristic of granitic rocks. The rounded shape suggests weathering, stream transport, or deliberate tumbling rather than its original outcrop form.
Field identification & locations
Identify it by testing for abundant quartz and feldspar, a speckled interlocking texture, and hardness greater than steel or a knife blade; a streak test is generally white. Common worldwide, especially in continental shields and mountain belts.
