igneous
Pink Granite (Glacial Cobble)
Granite (rich in Potassium Feldspar / Orthoclase)
Hardness: 6-7 on Mohs scale; Color: Pinkish-red, translucent quartz grey, speckled with dark biotite/amphibole; Luster: Vitreous to dull (weathered surface); Texture: Phaneritic (coarse-grained, visible interlocked crystals).
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull (weathered surface)
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pinkish-red, translucent quartz grey, speckled with dark biotite/amphibole; Luster: Vitreous to dull (weathered surface); Texture: Phaneritic (coarse-grained, visible interlocked crystals).
Formation & geological history
Formed deep underground through the slow cooling and crystallization of silica-rich felsic magma. This particular rounded piece was eroded and smoothed into a river cobble or glacial pebble by water and ice movement over thousands to millions of years.
Uses & applications
Dimension stone, building construction, countertops, railway ballast, and decorative landscaping stone.
Geological facts
Granite makes up a large portion of Earth's continental crust. The pink coloration comes specifically from potassium-rich alkali feldspar (orthoclase or microcline).
Field identification & locations
Identified in the field by its distinct interlocking coarse crystals of pink feldspar, translucent quartz, and dark mica/amphibole spots, along with its heavy, hard, and rounded cobble shape. Found worldwide in glaciated regions, mountain streams, and igneous batholith exposures.
