igneous
Weathered granite boulder
Granite, typically quartz–feldspar–mica assemblage
AI-generated identification · may be incorrectCoarse-grained, pale gray to pinkish rock with visible quartz and feldspar, dark mica, and iron-oxide staining; usually Mohs 6–7, glassy to dull luster, massive texture, no cleavage as a whole, and specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, pale gray to pinkish rock with visible quartz and feldspar, dark mica, and iron-oxide staining; usually Mohs 6–7, glassy to dull luster, massive texture, no cleavage as a whole, and specific gravity about 2.6–2.7.
Formation & geological history
A plutonic igneous rock crystallized slowly from silica-rich magma deep underground, commonly during Precambrian to Paleozoic mountain-building; uplift, glacial transport, and long-term weathering produced the rounded boulder and surface staining.
Uses & applications
Used as dimension stone, curbing, aggregate, monuments, landscaping, and building cladding; this naturally weathered specimen has little gem or commercial value.
Geological facts
The rounded form and exfoliating, granular surface are characteristic of prolonged chemical weathering and/or glacial abrasion. Individual mineral grains may be identifiable with a hand lens.
Field identification & locations
Identify granite by its interlocking quartz–feldspar–mica grains, hard scratch resistance, and lack of layering or strong foliation; common in continental mountain belts and glacial terrains worldwide.
