igneous
Rounded granite pebble
Granite, predominantly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled pink-gray and black, with a granular texture and vitreous-to-dull luster. Hardness is approximately 6–7 Mohs; quartz and feldspar show no strong cleavage at the specimen scale, and specific gravity is about 2.6–2.7.
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Physical properties
Coarse-grained, speckled pink-gray and black, with a granular texture and vitreous-to-dull luster. Hardness is approximately 6–7 Mohs; quartz and feldspar show no strong cleavage at the specimen scale, and specific gravity is about 2.6–2.7.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma, likely millions to billions of years ago, then rounded by stream or glacial abrasion. The visible specimen appears naturally weathered or tumbled.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and landscaping material; attractive pieces are collected but are generally low-value.
Geological facts
The pink grains are commonly potassium feldspar, gray translucent grains are quartz, and black grains are biotite or hornblende. Its interlocking crystals make granite durable and resistant to abrasion.
Field identification & locations
Identify it by visible interlocking pink/white/gray crystals and black mica or amphibole, unlike basalt, which is usually dark and fine-grained. Common worldwide, especially in continental shields and mountain belts.
