igneous
Weathered granite or granitic gravel
Granite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectHardness about 6–7 Mohs; gray to tan, granular texture, dull to vitreous luster, and no obvious cleavage as a whole. Visible grains likely include quartz, feldspar, and dark mica or amphibole; specific gravity is about 2.6–2.7.
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Physical properties
Hardness about 6–7 Mohs; gray to tan, granular texture, dull to vitreous luster, and no obvious cleavage as a whole. Visible grains likely include quartz, feldspar, and dark mica or amphibole; specific gravity is about 2.6–2.7.
Formation & geological history
A coarse-grained intrusive igneous rock formed by slow cooling of silica-rich magma deep in Earth’s crust, commonly during Precambrian to younger continental mountain-building events. Its rounded shape and weathered surface indicate erosion and transport.
Uses & applications
Used widely as crushed stone, aggregate, building stone, monuments, countertops, and landscaping gravel; this small piece has little commercial value.
Geological facts
Granite’s interlocking crystals make it durable and resistant to abrasion. Exact identification is uncertain from the photograph alone because the specimen is small, weathered, and poorly resolved.
Field identification & locations
Look for visible interlocking light quartz/feldspar grains with scattered black mica or amphibole; a steel nail should not scratch it easily, while quartz may scratch glass. Common worldwide, especially in continental shield and mountain regions.
