igneous
Crushed granite aggregate
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole
AI-generated identification · may be incorrectTypically gray, pink, white, and black with granular texture and vitreous-to-dull luster; individual minerals are Mohs 2–7, while the aggregate has no single hardness or cleavage. The angular chips indicate mechanical crushing rather than natural weathering.
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Physical properties
Typically gray, pink, white, and black with granular texture and vitreous-to-dull luster; individual minerals are Mohs 2–7, while the aggregate has no single hardness or cleavage. The angular chips indicate mechanical crushing rather than natural weathering.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic mountain-building events; this material was quarried and crushed for aggregate.
Uses & applications
Widely used for landscaping, pathways, driveways, drainage, road base, asphalt, and concrete; rarely used as jewelry or collectible specimens in this crushed form.
Geological facts
Quartz grains are commonly translucent gray, feldspar grains white or pink, and dark flakes are biotite or amphibole. Color varies substantially by quarry and source rock.
Field identification & locations
Identify by interlocking visible quartz and feldspar grains, mixed pink-gray coloration, and hard angular fragments; it is commonly found in quarry products, roads, gardens, and construction sites. A magnet test may attract only minor iron-bearing grains.
