igneous
Pink Granite (Water-worn Cobble)
Granite (Alkali-feldspar granite)
Hardness: 6-7 (Mohs scale); Color: Pink/Red due to potassium feldspar, with grey quartz and dark biotite/hornblende; Luster: Dull (weathered) to vitreous (fresh); Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 - 2.75.
- Hardness
- 6-7 (Mohs scale)
- Luster
- Dull (weathered) to vitreous (fresh)
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pink/Red due to potassium feldspar, with grey quartz and dark biotite/hornblende; Luster: Dull (weathered) to vitreous (fresh); Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 - 2.75.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specific specimen has been Rounded and smoothed by water transport (fluvial or glacial action).
Uses & applications
Used in construction as aggregate, countertops, monuments, and landscaping. Polished stones are used in home decor.
Geological facts
Granite makes up the majority of Earth's continental crust. The pink color specifically comes from an abundance of orthoclase feldspar.
Field identification & locations
Identify by the 'salt and pepper' look combined with pink hues and high hardness (cannot be scratched by a steel nail). Commonly found in glacial till, riverbeds, and mountainous regions like the Canadian Shield.
