igneous
Pink granite pebble
Granite, chiefly quartz–feldspar–mica; likely K-feldspar-rich pink granite
AI-generated identification · may be incorrectCoarse-grained, speckled pink, gray, and black; glassy-to-dull luster, interlocking crystals, and no prominent cleavage as a whole. Individual minerals are approximately Mohs 2–7; specific gravity is about 2.63–2.75.
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Physical properties
Coarse-grained, speckled pink, gray, and black; glassy-to-dull luster, interlocking crystals, and no prominent cleavage as a whole. Individual minerals are approximately Mohs 2–7; specific gravity is about 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma slowly crystallized deep underground, commonly during Precambrian to Phanerozoic continental crust formation. This specimen was later rounded by stream, beach, or glacial transport and abrasion.
Uses & applications
Used widely as dimension stone, countertops, monuments, paving, aggregate, and decorative landscaping material; polished pebbles are inexpensive collector or craft items.
Geological facts
The pink color usually comes from potassium feldspar, gray translucent grains from quartz, and black flecks from biotite or hornblende. Its contrasting mineral grains reflect slow cooling rather than volcanic eruption.
Field identification & locations
Identify it by visible interlocking pink feldspar, gray quartz, and dark mica/hornblende; it is harder and coarser than pink sandstone. Common worldwide in continental shields, granite plutons, river gravels, and glacial deposits.
