igneous
Red granite pebble
Granite, chiefly quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectCoarse crystalline, pink-red with black flecks and a glossy, possibly wet surface; Mohs hardness about 6–7, no consistent cleavage as a whole, and specific gravity roughly 2.6–2.7.
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Physical properties
Coarse crystalline, pink-red with black flecks and a glossy, possibly wet surface; Mohs hardness about 6–7, no consistent cleavage as a whole, and specific gravity roughly 2.6–2.7.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing visible crystals to grow. Granite occurs in continental crust of many geological ages.
Uses & applications
Granite is used for building stone, countertops, paving, and decorative landscaping; this small rounded specimen is mainly suitable for collecting.
Geological facts
Its red color commonly comes from potassium feldspar, while the dark flecks are mafic minerals such as biotite or hornblende.
Field identification & locations
The interlocking light and dark mineral grains and pink feldspar are characteristic; the rounded shape suggests natural abrasion. Similar granite is widespread worldwide, including in ancient continental shields and mountain belts.
