igneous
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
Hardness: 6-7 on Mohs scale; Color: Gray, pinkish, and white mottling; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: None (fractures irregularly); Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, pinkish, and white mottling
- Luster
- Dull to vitreous
Identified More igneous →
Explore Granite (Weathered) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, pinkish, and white mottling; Luster: Dull to vitreous; Crystal structure: Phaneritic (coarse-grained); Cleavage: None (fractures irregularly); Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specimen shows surface weathering and lichen growth, suggesting exposure to the elements for decades. Geological age varies by site, often ranging from 100 million to 300 million years old.
Uses & applications
Used widely in construction as dimension stone for countertops, flooring, and monuments. Coarse granite is also crushed for road base and railroad ballast. This specific rough specimen is used as landscape rock.
Geological facts
Granite is the primary component of the Earth's continental crust. It is one of the hardest natural stones and was used by ancient civilizations, like the Egyptians, to build pyramids and obelisks.
Field identification & locations
Identify by its 'salt and pepper' appearance caused by interlocking crystals of quartz, feldspar, and mica. Check for a speckled texture that doesn't rub off. Highly common in mountain ranges like the Rockies or Appalachians. Collectors should look for unweathered surfaces to see crystal clarity.
