igneous
Likely weathered granite or granitic gneiss fragment
Granite; mainly quartz (SiO₂), feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse speckled gray-green material with translucent glassy grains and darker mafic minerals; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, and no obvious cleavage as a whole rock. The image is blurred, so exact identification is uncertain.
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Physical properties
Coarse speckled gray-green material with translucent glassy grains and darker mafic minerals; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, and no obvious cleavage as a whole rock. The image is blurred, so exact identification is uncertain.
Formation & geological history
Formed by slow cooling of silica-rich magma deep underground, commonly during Precambrian to younger continental crust formation; surface weathering produced the rounded, stained appearance.
Uses & applications
Used widely as building stone, aggregate, countertops, monuments, and landscaping material; this small fragment has negligible commercial value.
Geological facts
Granite’s visible grains are typically quartz, white or pink feldspar, and black mica or amphibole; green coloration may reflect weathered minerals or chlorite.
Field identification & locations
Look for interlocking light and dark grains, hardness sufficient to scratch glass, and lack of fizz with dilute acid. Common worldwide, especially in continental shields and mountain belts.
