igneous
Crushed quartz-rich granite/pegmatite gravel
Granite to granitic pegmatite; chiefly quartz (SiO₂), feldspars, and minor mica
AI-generated identification · may be incorrectTypically white, pink, gray, or tan with a granular texture and vitreous-to-dull luster; quartz hardness 7, feldspar about 6, with no dominant cleavage in quartz but good cleavage in feldspar. The irregular angular pieces indicate mechanically crushed stone rather than natural rounded gravel.
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Physical properties
Typically white, pink, gray, or tan with a granular texture and vitreous-to-dull luster; quartz hardness 7, feldspar about 6, with no dominant cleavage in quartz but good cleavage in feldspar. The irregular angular pieces indicate mechanically crushed stone rather than natural rounded gravel.
Formation & geological history
Coarse igneous rock crystallized slowly from silica-rich magma, commonly in continental crust; individual granite bodies may range from Precambrian to Mesozoic or younger. The material was later quarried and crushed for aggregate.
Uses & applications
Used as landscaping gravel, road base, drainage stone, concrete aggregate, and sometimes decorative stone. Ordinary crushed material has little jewelry value.
Geological facts
The pink and white colors commonly reflect potassium feldspar and quartz, while dark flecks are biotite or amphibole. Some pieces may instead be quartzite or feldspar-rich pegmatite, which cannot be separated confidently from the image alone.
Field identification & locations
Identify by visible interlocking grains, abundant glassy quartz, blocky feldspar, and occasional mica; a steel file generally scratches feldspar but not quartz. Common worldwide near granite quarries and construction sites.
