igneous
Pink Granite Cobble
Phaneritic Felsic Plutonic Rock (Granite)
Hardness: 6-7 Mohs; Color: Pink, white, gray, and black speckles; Luster: Dull (weathered) to vitreous (crystals); Crystal Structure: Phaneritic (coarse-grained, visible crystals); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, white, gray, and black speckles
- Luster
- Dull (weathered) to vitreous (crystals)
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, gray, and black speckles; Luster: Dull (weathered) to vitreous (crystals); Crystal Structure: Phaneritic (coarse-grained, visible crystals); Specific Gravity: 2.63-2.75
Formation & geological history
Formed by the slow cooling of silica-rich magma deep underground, typically within continental crust. This specimen shows significant rounding, suggesting it was transported by water or glacial action after weathering.
Uses & applications
Used widely in construction as crushed stone, dimension stone for countertops and monuments, and as decorative landscaping rock.
Geological facts
Granite is the most common rock found in the Earth's continental crust. Its pink color is primarily caused by an abundance of potassium feldspar (orthoclase).
Field identification & locations
Identify in the field by its speckled appearance of interlocking crystals. This specific cobble shape indicates it was found in a riverbed or glacial till area. Common in shield regions like Canada or the Northern US.
