igneous
Granite fragment (likely weathered granite)
Granite; mainly quartz (SiO₂), feldspar, and mica (biotite/muscovite)
AI-generated identification · may be incorrectCoarse-grained, speckled gray-and-white texture with dark mica; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a rock. The rounded edges suggest abrasion or tumbling.
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Physical properties
Coarse-grained, speckled gray-and-white texture with dark mica; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a rock. The rounded edges suggest abrasion or tumbling.
Formation & geological history
Intrusive felsic igneous rock formed by slow cooling of silica-rich magma several kilometers underground, commonly during Precambrian through Phanerozoic mountain-building events. Exact age cannot be determined visually.
Uses & applications
Widely used as dimension stone, countertops, monuments, aggregate, and paving; small attractive pieces are inexpensive geological specimens.
Geological facts
Granite’s visible grains record slow underground crystallization; pink, white, or gray feldspar and black mica are typical diagnostic components.
Field identification & locations
Look for interlocking quartz and feldspar grains, black mica flakes, and a hard, scratch-resistant surface. Common worldwide, especially in continental shields and mountain belts; a hand lens and acid test help distinguish it from sandstone or concrete.
