igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: Salt-and-pepper (tan, white, black, pink); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: None in the rock itself, though individual minerals may have it.
- Hardness
- 6-7 on Mohs scale
- Color
- Salt-and-pepper (tan, white, black, pink)
- Luster
- Vitreous to dull
Identified More igneous →
Explore Granite Pebble 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: Salt-and-pepper (tan, white, black, pink); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: None in the rock itself, though individual minerals may have it.
Formation & geological history
Formed through the slow crystallization of silica-rich magma beneath the Earth's surface. This specimen appears to be a water-worn or weathered pebble fragment.
Uses & applications
Used extensively in construction for countertops, floor tiles, and gravel. On this scale, it is typically used as aggregate or landscaping stone.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Because of its hardness and resistance to weathering, it is the primary material for the base of many ancient mountain ranges.
Field identification & locations
Identify by looking for a 'salt and pepper' appearance with distinct mineral grains visible to the naked eye. Commonly found in riverbeds, glacial deposits, and mountain ranges.
