igneous
Granite Pebble
Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)
Hardness: 6-7 Mohs; Color: Salt-and-pepper (white, gray, black); Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 Mohs
- Color
- Salt-and-pepper (white, gray, black)
- Luster
- Vitreous to pearly
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 Mohs; Color: Salt-and-pepper (white, gray, black); Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. Found in continental crust, often appearing in mountain ranges after millions of years of erosion.
Uses & applications
Used widely in construction as crushed stone, dimension stone for countertops and monuments, and for decorative landscaping.
Geological facts
Granite is the most common rock found in the Earth's continental crust and is unique to Earth among the planets in our solar system.
Field identification & locations
Look for a crystalline texture where small individual crystals of quartz and feldspar are visible. It is very hard and will scratch glass. Common in riverbeds and mountainous terrain.
