igneous
Quartz-rich granitic rock (likely granite or granitic pegmatite)
Granite/pegmatite; chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse, speckled texture with translucent gray quartz, pale feldspar, and dark mica or amphibole; vitreous quartz luster, Mohs hardness about 6–7, no strong cleavage in quartz, and typical specific gravity around 2.6–2.7.
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Physical properties
Coarse, speckled texture with translucent gray quartz, pale feldspar, and dark mica or amphibole; vitreous quartz luster, Mohs hardness about 6–7, no strong cleavage in quartz, and typical specific gravity around 2.6–2.7.
Formation & geological history
A slowly cooled intrusive igneous rock formed when silica-rich magma crystallized underground, generally during Precambrian to Phanerozoic geological episodes. The specimen appears naturally broken or roughly trimmed rather than highly polished.
Uses & applications
Used as building stone, aggregate, countertops, monuments, and decorative stone; small pieces are mainly educational or collectible rather than gem material.
Geological facts
The interlocking crystals record slow cooling beneath the surface. Larger crystals and abundant quartz would favor a pegmatite classification, while finer uniform grains indicate ordinary granite.
Field identification & locations
Identify it by its visible interlocking quartz, feldspar, and dark mineral grains; quartz will resist scratching by steel, while feldspar commonly shows cleavage. Common worldwide in continental crust, especially granite batholiths and pegmatite districts.
