igneous
Quartz-bearing granite or pegmatite fragment
Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende
AI-generated identification · may be incorrectSmall, irregular, coarse-grained specimen with pale gray/white crystals and a dark inclusion; quartz has Mohs hardness 7, glassy luster, and no cleavage, while feldspar is hardness 6–6.5 with two cleavages. Exact identification is limited by the image’s scale and resolution.
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Physical properties
Small, irregular, coarse-grained specimen with pale gray/white crystals and a dark inclusion; quartz has Mohs hardness 7, glassy luster, and no cleavage, while feldspar is hardness 6–6.5 with two cleavages. Exact identification is limited by the image’s scale and resolution.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep within the continental crust, commonly during Precambrian to Phanerozoic intrusive events; if pegmatitic, it formed from a late, fluid-rich magmatic phase.
Uses & applications
Granite is widely used as dimension stone, aggregate, countertops, monuments, and building material; small fragments generally have little commercial value.
Geological facts
The visibly contrasting crystals indicate an intrusive igneous texture rather than a sedimentary or metamorphic rock. Dark grains may be biotite mica or amphibole.
Field identification & locations
Common in continental mountain belts and exposed plutons worldwide. Look for interlocking visible crystals, hardness sufficient to scratch glass, and quartz’s lack of cleavage; a fresh streak or magnification would improve identification.
