igneous
Rounded pink granite cobble
Granite, chiefly quartz–alkali feldspar–plagioclase–biotite
AI-generated identification · may be incorrectCoarse-grained, speckled pink, gray, and black; likely Mohs 6–7, with vitreous quartz, feldspar cleavage, and granular interlocking crystals. Typical specific gravity is about 2.6–2.7.
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Physical properties
Coarse-grained, speckled pink, gray, and black; likely Mohs 6–7, with vitreous quartz, feldspar cleavage, and granular interlocking crystals. Typical specific gravity is about 2.6–2.7.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic plutonic events; its rounded shape indicates later weathering and transport by water or glacial action.
Uses & applications
Used as dimension stone, paving and construction aggregate, landscaping stone, monuments, and decorative polished material; this small cobble has mainly ornamental or educational value.
Geological facts
The pink color usually comes from potassium feldspar, while dark flecks are commonly biotite or hornblende. Granite is not a single mineral but a rock made of interlocking crystals.
Field identification & locations
Identify it by visible coarse crystals, pink feldspar, gray translucent quartz, and black mica, without layering or foliation; common worldwide, especially in continental shields and mountain batholiths.
