igneous
Polished pink-and-gray granite
Granite, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse crystalline, mottled gray, white, and salmon-pink; vitreous to dull luster with interlocking grains and no obvious cleavage. Hardness is approximately 6–7 Mohs; specific gravity about 2.63–2.75.
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Physical properties
Coarse crystalline, mottled gray, white, and salmon-pink; vitreous to dull luster with interlocking grains and no obvious cleavage. Hardness is approximately 6–7 Mohs; specific gravity about 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma slowly cooled deep underground, allowing visible crystals to grow. Most granite is Precambrian to younger, commonly tens to thousands of millions of years old.
Uses & applications
Widely used for countertops, monuments, building stone, aggregate, and decorative polished stones. This small rounded piece has modest specimen value.
Geological facts
The pink areas are potassium feldspar, gray translucent grains are quartz, and darker portions are mafic minerals or weathered inclusions. Its rounded shape likely reflects natural abrasion or tumbling/polishing.
Field identification & locations
Identify it by its granular “salt-and-pepper” texture, interlocking crystals, and pink feldspar; it should not fizz with dilute acid. Common worldwide, especially in continental batholiths such as India, Brazil, Scandinavia, and North America.
