igneous
Pink granite pebble
Granite, composed mainly of quartz, potassium feldspar, plagioclase feldspar, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, mottled pink-white-gray appearance with black mica or amphibole; Mohs hardness about 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a whole. The rounded shape indicates water or glacial abrasion.
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Physical properties
Coarse-grained, mottled pink-white-gray appearance with black mica or amphibole; Mohs hardness about 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a whole. The rounded shape indicates water or glacial abrasion.
Formation & geological history
An intrusive felsic igneous rock that crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to younger continental pluton formation. It was later exposed by uplift and erosion.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and landscaping material; attractive polished pieces are collected as decorative specimens.
Geological facts
Pink coloration generally comes from potassium feldspar, while dark grains are biotite or hornblende. Granite’s visible crystals distinguish it from fine-grained rhyolite.
Field identification & locations
Identify it by its visibly interlocking pink feldspar, translucent-gray quartz, and black minerals; it commonly occurs in continental mountain belts, glacial deposits, streambeds, and granite quarries. A hand lens and scratch test help confirm it.
