igneous
Granite (Weathered)
Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: Pinkish-brown with dark speckles; Luster: Dull (weathered) to vitreous (fresh); Crystal structure: Phaneritic (visible crystals); Specific gravity: 2.63-2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pinkish-brown with dark speckles
- Luster
- Dull (weathered) to vitreous (fresh)
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pinkish-brown with dark speckles; Luster: Dull (weathered) to vitreous (fresh); Crystal structure: Phaneritic (visible crystals); Specific gravity: 2.63-2.75
Formation & geological history
Formed through the slow cooling and solidification of magma deep beneath the Earth's surface (plutonic), typically in continental crust environments. This specimen shows significant rounding and surface oxidation from water or wind erosion.
Uses & applications
Used extensively in construction for countertops, floor tiles, and monuments. Weathered river-worn pieces are often used in landscaping or as decorative stones.
Geological facts
Granite is the primary component of the Earth's continental crust. Because it forms at great depths, it is only exposed at the surface after massive amounts of overlying rock have been eroded away.
Field identification & locations
Identify in the field by its speckled 'salt and pepper' appearance and its extreme hardness; it will easily scratch copper or a steel nail. This rounded specimen is likely a river rock or glacial erratic.
