igneous
Polished pink granite pebble
Granite; primarily quartz, potassium feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectCoarse crystalline texture with salmon-pink feldspar, pale quartz, and dark mineral grains; vitreous to dull luster, no obvious cleavage as a rock, Mohs hardness about 6–7, and specific gravity approximately 2.63–2.75.
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Physical properties
Coarse crystalline texture with salmon-pink feldspar, pale quartz, and dark mineral grains; vitreous to dull luster, no obvious cleavage as a rock, Mohs hardness about 6–7, and specific gravity approximately 2.63–2.75.
Formation & geological history
Granite forms when silica-rich magma slowly crystallizes deep in continental crust, commonly during Precambrian to younger continental mountain-building events. This rounded specimen was likely smoothed by stream or beach abrasion and polished.
Uses & applications
Used widely as dimension stone, countertops, monuments, paving, aggregate, and landscaping stone; polished pebbles are sold for decoration and collections.
Geological facts
The pink color mainly reflects potassium feldspar, while dark streaks or patches represent mafic minerals or weathering. Its visible interlocking crystals distinguish it from glassy or fine-grained volcanic rocks.
Field identification & locations
Identify it by its visible quartz-feldspar crystal mosaic, hardness, and lack of layering or fossils; a streak test is generally ineffective. Common worldwide, especially in granitic terrains and gravel deposits.
