igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Salt and pepper appearance with tan, white, and black hues; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Composition: Quartz, feldspar, and mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Salt and pepper appearance with tan, white, and black hues
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Salt and pepper appearance with tan, white, and black hues; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Composition: Quartz, feldspar, and mica.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specimen appears to be a water-worn or weathered cobble from a riverbed or glacial deposit. Formed across various geological eras, primarily during mountain-building events.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, and memorial monuments. Small cobbles are often used for landscaping.
Geological facts
Granite is the most common igneous rock found in Earth's continental crust. Its high quartz content makes it exceptionally resistant to weathering compared to other rocks.
Field identification & locations
Identify in the field by its speckled, interlocking crystal texture and extreme hardness (it will scratch glass). Commonly found in mountainous regions or as tumbled 'river rocks' in glacial outwash plains.
