igneous
Pink granite (rounded cobble)
Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, pink-and-black speckled texture with vitreous quartz and feldspar luster; interlocking crystals, no cleavage as a whole. Hardness is approximately 6–7 Mohs; specific gravity about 2.63–2.75.
Identified More igneous →
Explore Pink granite (rounded cobble) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse-grained, pink-and-black speckled texture with vitreous quartz and feldspar luster; interlocking crystals, no cleavage as a whole. Hardness is approximately 6–7 Mohs; specific gravity about 2.63–2.75.
Formation & geological history
A felsic intrusive igneous rock formed by slow crystallization of silica-rich magma deep in the crust, commonly during Precambrian to younger continental plutonic events. The rounded shape is produced by stream or beach abrasion, or human tumbling.
Uses & applications
Used for countertops, building stone, monuments, paving, aggregate, and decorative spheres or cabochons. This ordinary rounded specimen has modest collecting value.
Geological facts
Its pink color mainly reflects potassium feldspar, while dark grains are biotite or amphibole and translucent grains are quartz. Granite is identified by visible interlocking crystals rather than layers or vesicles.
Field identification & locations
Common in continental shields and granitic terrains worldwide, including Scandinavia, Canada, India, Brazil, and the United States. A glassy quartz grain and feldspar cleavage help distinguish it from similarly colored rhyolite.
