igneous
Pink Granite Cobble
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: Pink, reddish-brown with white and gray specs; Luster: Dull (weathered); Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct in hand sample; Specific gravity: 2.63-2.75.
- Hardness
- 6-7 Mohs
- Color
- Pink, reddish-brown with white and gray specs
- Luster
- Dull (weathered)
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, reddish-brown with white and gray specs; Luster: Dull (weathered); Crystal structure: Phaneritic (coarse-grained); Cleavage: Indistinct in hand sample; Specific gravity: 2.63-2.75.
Formation & geological history
Formed by the slow cooling of silica-rich magma deep underground. This specific specimen is a water-worn cobble, likely eroded from a larger batholith and smoothed by glacial or river transport.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, and as a decorative landscaping stone.
Geological facts
Granite makes up a large part of the Earth's continental crust. Its pink color is derived from potassium-rich alkali feldspar.
Field identification & locations
Identify by its interlocking crystalline grains of quartz (glassy) and feldspar (pink/white blocky). Common in mountainous regions and glacial deposits.
