igneous
Weathered granitic rock (likely granite or granodiorite)
Granite–granodiorite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse, granular texture with pale feldspar/quartz and darker mica or mafic grains; likely Mohs hardness 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.8. The rounded shape and brown surface indicate strong weathering or abrasion.
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Physical properties
Coarse, granular texture with pale feldspar/quartz and darker mica or mafic grains; likely Mohs hardness 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.8. The rounded shape and brown surface indicate strong weathering or abrasion.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep underground, commonly hundreds of millions to billions of years old; later uplift, erosion, and weathering rounded this fragment.
Uses & applications
Used as crushed aggregate, road stone, building stone, monuments, and architectural slabs; attractive specimens may be collected but this example appears common and low value.
Geological facts
Granite’s interlocking crystals make it durable, while feldspar commonly alters to clay, producing the tan-brown weathered rind visible here.
Field identification & locations
Identify it by visible interlocking light crystals, scattered dark minerals, and lack of layering or foliation; a fresh broken surface and hand lens would distinguish granite from granodiorite. Common worldwide in continental crust and granitic mountain belts.
