igneous
Granite Pebble
Granite
Mohs hardness 6 to 7. Color: speckled gray, white, quartz-tinted, and black. Luster: dull to glassy. Granular phaneritic texture. Specific gravity: approx. 2.65-2.75.
- Color
- speckled gray, white, quartz-tinted, and black
- Luster
- dull to glassy
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
Mohs hardness 6 to 7. Color: speckled gray, white, quartz-tinted, and black. Luster: dull to glassy. Granular phaneritic texture. Specific gravity: approx. 2.65-2.75.
Formation & geological history
Formed by the slow cooling and crystallization of felsic magma deep within the Earth's crust (plutonic environment). Subsequently eroded and rounded by water transport into a stream/river pebble.
Uses & applications
Used in construction, decorative landscaping, aggregate, and as a common beach/river rock specimen for beginner collectors.
Geological facts
Granite is one of the most abundant intrusive igneous rocks in Earth's continental crust. It forms the core of many continental mountain ranges.
Field identification & locations
Identified by its salt-and-pepper speckled interlocking mineral grains (quartz, feldspar, mica). Found in riverbeds, glacial deposits, and coastal beaches worldwide.
