![Granitoid (Common Granite/Gneiss) (Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)) — igneous](https://media.rock.id/granitoid-common-granite-gneiss-e49236e2-e18d-40a4-804b-0f8d5f00ae5a-compressed.jpg)
igneous
Granitoid (Common Granite/Gneiss)
Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)
Hardness: 6-7 on Mohs scale. Color: Mottled grey, white, and black. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible grains). Specific gravity: 2.6-2.7.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled grey, white, and black
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled grey, white, and black. Luster: Dull to vitreous. Crystal structure: Phaneritic (visible grains). Specific gravity: 2.6-2.7.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears water-worn or weathered, suggesting it was transported by water from its original plutonic source.
Uses & applications
Commonly used in construction as crushed stone, dimension stone for countertops and monuments, and for landscaping.
Geological facts
Granite is the most common igneous rock found in Earth's continental crust. It forms the core of many mountain ranges, such as the Sierra Nevada.
Field identification & locations
Identify by its 'salt and pepper' appearance and hardness (it will scratch glass). Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
