igneous
Granite Pebble
Intrusive Magmatic Granite (Quartz, Feldspar, Mica)
Hardness: 6-7 (Mohs scale); Color: Pink (Orthoclase), white/gray (Quartz), black (Biotite); Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained visible crystals).
- Hardness
- 6-7 (Mohs scale)
- Color
- Pink (Orthoclase), white/gray (Quartz), black (Biotite)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pink (Orthoclase), white/gray (Quartz), black (Biotite); Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained visible crystals).
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specimen shows water-worn rounding, likely from a river or glacial environment.
Uses & applications
Large deposits used for construction (countertops, monuments); pebbles are mostly collected for landscaping or hobbyist polishing.
Geological facts
Granite makes up a massive portion of the Earth's continental crust. The pink hue in this specific specimen comes from potassium-rich feldspar.
Field identification & locations
Identify by 'salt and pepper' appearance with pink highlights. Found globally in mountainous regions or transported via glacial till to riverbeds.
