igneous
Tumbled granite (likely pink granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectHardness about 6–7 Mohs; coarse, speckled pink, gray, white, and dark grains with a dull-to-glassy luster. Interlocking crystals and lack of cleavage are typical; the rounded shape indicates tumbling or water wear.
Identified More igneous →
Explore Tumbled granite (likely pink granite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness about 6–7 Mohs; coarse, speckled pink, gray, white, and dark grains with a dull-to-glassy luster. Interlocking crystals and lack of cleavage are typical; the rounded shape indicates tumbling or water wear.
Formation & geological history
Granite forms when silica-rich magma slowly crystallizes deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events. This specimen may be naturally weathered, but its smooth edges appear human-tumbled.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and decorative landscaping material; small polished pieces are inexpensive craft and collection stones.
Geological facts
The pink color generally comes from potassium feldspar, while translucent gray grains are quartz and black grains are biotite or amphibole.
Field identification & locations
Identify it by visible interlocking pink feldspar, gray quartz, and dark mica/amphibole grains; it is not easily scratched by steel. Common worldwide, especially in continental shield and mountain regions.
