igneous
Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale. Color: Salt-and-pepper (tan, white, and black). Luster: Dull to vitreous. Structure: Phaneritic (coarse-grained crystals). Composition: Primarily quartz, feldspar, and mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Salt-and-pepper (tan, white, and black)
- Luster
- Dull to vitreous
Identified More igneous →
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, and black). Luster: Dull to vitreous. Structure: Phaneritic (coarse-grained crystals). Composition: Primarily quartz, feldspar, and mica.
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface (plutonic). This specific specimen has been rounded and smoothed by fluvial or glacial erosion as a river stone.
Uses & applications
In this form, primarily for landscaping, river rock decor, or educational specimens. In bulk, granite is used for construction, countertops, and monuments.
Geological facts
Granite is the most common rock found in the Earth's continental crust. It is incredibly durable, which is why it is often found as rounded pebbles long after softer rocks have eroded away.
Field identification & locations
Identify by the visible grains of different minerals and its extreme hardness (cannot be scratched by a steel knife). Commonly found in riverbeds, glacial tills, and mountainous regions.
