igneous
Granitoid (Commonly Granite)
Phaneritic Felsic Igneous Rock
Mohs Hardness: 6-7. Color: Mottled grey, pinkish-orange, and black. Luster: Vitreous to dull. Structure: Granular/Crystalline. SG: 2.6-2.7.
- Hardness
- 6-7
- Color
- Mottled grey, pinkish-orange, and black
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Mohs Hardness: 6-7. Color: Mottled grey, pinkish-orange, and black. Luster: Vitreous to dull. Structure: Granular/Crystalline. SG: 2.6-2.7.
Formation & geological history
Formed by the slow crystallization of magma below the Earth's surface during various geological periods. Composed of quartz, feldspar, and amphibole/biotite.
Uses & applications
Used extensively in construction (countertops, flooring), monuments, and as crushed aggregate for infrastructure.
Geological facts
Granite is one of the most common rocks in the Earth's continental crust. Over millions of years, it can weather into river-worn cobbles like the one shown.
Field identification & locations
Identifiable by its 'salt and pepper' crystalline texture and extreme hardness. Often found in riverbeds or mountainous areas with exposed plutons.
