igneous
Weathered granite or granitic pegmatite fragment
Granite; chiefly quartz (SiO₂), feldspar, and minor biotite/hornblende
AI-generated identification · may be incorrectPale pink-beige, coarse crystalline texture with dark mineral flecks and a weathered surface; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, and no obvious cleavage as a whole. Individual feldspar crystals show cleavage, while quartz does not.
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Physical properties
Pale pink-beige, coarse crystalline texture with dark mineral flecks and a weathered surface; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, and no obvious cleavage as a whole. Individual feldspar crystals show cleavage, while quartz does not.
Formation & geological history
Intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events; surface weathering rounded this fragment.
Uses & applications
Widely used as crushed aggregate, dimension stone, countertops, monuments, and decorative landscaping material; this small weathered piece has little commercial value.
Geological facts
The pink coloration commonly comes from potassium feldspar, while black specks are biotite or amphibole. Strongly rounded edges and granular decomposition indicate prolonged physical and chemical weathering.
Field identification & locations
Identify it by visible interlocking quartz and feldspar grains, pale pink color, and hardness sufficient to scratch glass; acid produces no reaction. Common worldwide, especially in continental shields and mountain batholiths.
