igneous
Granite with Biotite Inclusions
Intrusive Igneous Rock (Quartz, Feldspar, Biotite)
Hardness: 6-7 on the Mohs scale. Color: Light grey/tan matrix with dark black spots. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, interlocking crystals). Specific gravity: 2.65-2.75.
- Hardness
- 6-7 on the Mohs scale
- Color
- Light grey/tan matrix with dark black spots
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on the Mohs scale. Color: Light grey/tan matrix with dark black spots. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, interlocking crystals). Specific gravity: 2.65-2.75.
Formation & geological history
Formed from the slow cooling and solidification of magma rich in silica and alumina beneath the Earth's surface over millions of years.
Uses & applications
Used in construction, monuments, paving stones, and architectural facings due to its durability.
Geological facts
Granite is the most common intrusive rock of the Earth's continental crust. The dark spots visible are typically biotite mica or hornblende crystals embedded in a lighter feldspar and quartz groundmass.
Field identification & locations
Easily identified by its speckled appearance of light and dark minerals. Common in mountainous regions and shield areas globally.
