igneous
Likely granite pebble
Granite, chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectLight gray-white, coarse crystalline, speckled black and pink; glassy quartz and pearly feldspar are typical. Mohs hardness about 6–7; massive, with no obvious cleavage as a whole; specific gravity roughly 2.6–2.8.
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Physical properties
Light gray-white, coarse crystalline, speckled black and pink; glassy quartz and pearly feldspar are typical. Mohs hardness about 6–7; massive, with no obvious cleavage as a whole; specific gravity roughly 2.6–2.8.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma cooled slowly deep underground, allowing visible crystals to grow. Most granite formed during Precambrian to Phanerozoic continental episodes, then reached the surface through uplift and erosion.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock. This small rounded specimen has mainly educational or modest collector value.
Geological facts
The rounded shape indicates transport and abrasion in a stream, beach, or glacial deposit. Black grains may be biotite mica or hornblende; exact identification would require a hand lens or thin section.
Field identification & locations
Identify it by its interlocking visible crystals, pale feldspar/quartz groundmass, and scattered dark minerals; it should not fizz with dilute hydrochloric acid. Common worldwide, especially in exposed continental mountain belts.
