igneous
Granite Pebble
Granite (Felsic intrusive igneous rock)
AI-generated identification · may be incorrectHardness: 6-7 on Mohs scale; Color: mottled pink, white, gray, and brown; Luster: vitreous to dull; Texture: phaneritic, medium to coarse-grained with rounded, river-worn surface; Specific Gravity: ~2.65-2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- mottled pink, white, gray, and brown
- 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: mottled pink, white, gray, and brown; Luster: vitreous to dull; Texture: phaneritic, medium to coarse-grained with rounded, river-worn surface; Specific Gravity: ~2.65-2.75.
Formation & geological history
Formed by the slow crystallization and cooling of silica-rich felsic magma deep beneath the Earth's crust, subsequently uplifted, eroded, and rounded by fluvial or glacial transport.
Uses & applications
Widely used in construction, architectural dimension stone, monuments, and gravel aggregates; smooth tumbled river pebbles are used for landscaping and aquariums.
Geological facts
Granite makes up the vast majority of continental crust. The pink and salmon coloration in specimens like this comes from potassium feldspar (orthoclase or microcline).
Field identification & locations
Easily identified by its interlocking crystalline grains of pink/white feldspar, glassy gray quartz, and dark flecks of mica or amphibole, worn smooth into an alluvial pebble.
