igneous
Granite Pebble (Salt and Pepper Granite)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)
Hardness: 6-7 on Mohs scale; Color: Mottled grey, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Inherent to mineral components (perfect in feldspar/mica, none in quartz).
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled grey, white, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled grey, white, and black; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: Inherent to mineral components (perfect in feldspar/mica, none in quartz).
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface (intrusive). This specific pebble shape is the result of mechanical weathering and water erosion, likely in a riverbed or coastal environment.
Uses & applications
Used widely in construction (aggregate, countertops, monuments), landscaping, and as a durable material for high-traffic surfaces.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The 'salt' refers to the light-colored quartz and feldspar, while the 'pepper' refers to dark minerals like biotite mica or hornblende.
Field identification & locations
Identify by its interlocking granular texture ('salt and pepper' look) and high hardness (will scratch glass). Common globally in mountainous regions and glacial deposits. For collectors, look for unique mineral inclusions or high-polish potential.
