igneous
Granite pebble
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled cream, gray, and black appearance; typically Mohs hardness 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a whole. The rounded shape indicates natural or human tumbling/erosion.
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Physical properties
Coarse-grained, speckled cream, gray, and black appearance; typically Mohs hardness 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a whole. The rounded shape indicates natural or human tumbling/erosion.
Formation & geological history
Intrusive igneous rock formed when silica-rich magma slowly cooled deep underground, commonly during Precambrian to Phanerozoic mountain-building events. Weathering and transport rounded this specimen.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping material; small attractive pieces are sold as curios or lapidary specimens.
Geological facts
The pale minerals are likely feldspar and quartz, while the dark grains are biotite or hornblende. Exact identification would benefit from a close-grained surface, hardness, and acid test.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Identify granite by visible interlocking light and dark crystals; unlike basalt, it is generally lighter colored and quartz-bearing.
