igneous
Granite pebble
Granite, composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectLight pinkish-gray, coarse-grained, granular texture with visible interlocking crystals; typically Mohs hardness 6–7, nonmetallic luster, no prominent cleavage as a rock, and specific gravity about 2.6–2.7.
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Physical properties
Light pinkish-gray, coarse-grained, granular texture with visible interlocking crystals; typically Mohs hardness 6–7, nonmetallic luster, no prominent cleavage as a rock, and specific gravity about 2.6–2.7.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma slowly cooled deep underground, allowing large crystals to grow; individual specimens may range from Precambrian to younger ages depending on source.
Uses & applications
Widely used as crushed aggregate, building stone, countertops, monuments, paving, and landscaping material; this small rounded piece has little commercial or collector value.
Geological facts
Its pink color commonly reflects potassium feldspar, while darker flecks are likely biotite or hornblende. The rounded shape indicates transport and abrasion by water, ice, or weathering.
Field identification & locations
Identify it by its speckled, interlocking crystals and inability to scratch with a steel knife; quartz grains resist scratching, while feldspar commonly shows flat cleavage surfaces. Common worldwide, especially in continental mountain belts.
