igneous
Pink Granite Boulder
Granite (Felsic Intrusive Igneous Rock)
Hardness: 6-7 Mohs; Color: Pink, grey, and black mottled pattern; Luster: Dull (weathered surface) to vitreous (on fresh breaks); Texture: Phaneritic (visible crystals); Composition: Potassium feldspar, quartz, and mica.
- Hardness
- 6-7 Mohs
- Color
- Pink, grey, and black mottled pattern
- Luster
- Dull (weathered surface) to vitreous (on fresh breaks)
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, grey, and black mottled pattern; Luster: Dull (weathered surface) to vitreous (on fresh breaks); Texture: Phaneritic (visible crystals); Composition: Potassium feldspar, quartz, and mica.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specific rounded shape indicates it was later eroded and smoothed by water or glacial transport, likely during the Pleistocene epoch.
Uses & applications
Used extensively in construction for countertops, floor tiles, and monuments. In its raw form, it is used for landscaping, road ballast, and riprap.
Geological facts
Granite is the primary constituent of the Earth's continental crust. Its pink color comes from a high concentration of orthoclase feldspar. It is one of the most durable natural stones against weathering.
Field identification & locations
Identify in the field by the interlocking 'salt and pepper' crystalline texture and notable hardness (cannot be scratched by a steel nail). Commonly found in the cores of mountain ranges or as glacial erratics in northern regions.
