igneous
Granite Cobble
Granite
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: White and grey with black specks; Luster: Dull/earthy (weathered); Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- White and grey with black specks
- Luster
- Dull/earthy (weathered)
Identified More igneous →
Explore Granite Cobble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 Mohs; Color: White and grey with black specks; Luster: Dull/earthy (weathered); Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63-2.75
Formation & geological history
Formed from the slow cooling and crystallization of magma beneath the Earth's surface. This specimen appears water-worn or weathered, indicating transportation in a river or glacial environment.
Uses & applications
Used in construction, countertops, monuments, and as aggregate. Rounded cobbles are often used in landscaping and drainage.
Geological facts
Granite is the primary component of the Earth's continental crust. Its name comes from the Latin 'granum', meaning grain, referring to its coarse-grained texture.
Field identification & locations
Identify by its interlocking crystalline texture (salt-and-pepper look) and high hardness. It is one of the most common rocks found in riverbeds and glacial tills worldwide.
