igneous
Weathered granite fragment
Granite, primarily quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled gray-brown rock with visible interlocking mineral grains; quartz has Mohs hardness 7, feldspar 6, and mica 2–3. Typically vitreous to pearly luster, no regular cleavage as a rock, and specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, mottled gray-brown rock with visible interlocking mineral grains; quartz has Mohs hardness 7, feldspar 6, and mica 2–3. Typically vitreous to pearly luster, no regular cleavage as a rock, and specific gravity about 2.6–2.7.
Formation & geological history
An intrusive felsic igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic tectonic events. The specimen appears strongly weathered or rounded by erosion.
Uses & applications
Widely used as crushed aggregate, paving stone, monuments, countertops, and building cladding; this small weathered fragment has little commercial or jewelry value.
Geological facts
Granite’s large crystals record slow underground cooling. Dark grains are likely biotite or amphibole, while pale grains are feldspar and quartz.
Field identification & locations
Identify it by its visibly interlocking, multicolored grains and lack of layering or obvious pores; a glassy streak or uniform texture would suggest a different material. Common worldwide, especially in continental shields and mountain belts.
