igneous
Granite (Weathered River Rock)
Granite (Phaneritic Igneous Rock)
Hardness: 6-7 Mohs; Color: Salt and pepper mixture of tan, gray, and white; Luster: Dull to vitreous; Crystal Structure: Phaneritic (visible crystals); Cleavage: Distinct in feldspar grains; Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper mixture of tan, gray, and white
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper mixture of tan, gray, and white; Luster: Dull to vitreous; Crystal Structure: Phaneritic (visible crystals); Cleavage: Distinct in feldspar grains; Specific Gravity: 2.63-2.75
Formation & geological history
Formed by the slow crystallization of silica-rich magma beneath the Earth's surface. This specimen shows significant rounding and weathering, typical of transport in a river or stream environment.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, and as crushed aggregate for infrastructure. Smooth specimens are often used in landscaping or as decorative stones.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Unlike oceanic crust which is primarily basalt, continental crust is mostly granitic. It is one of the hardest and most durable natural stones.
Field identification & locations
Identify by looking for a coarse-grained texture where individual mineral grains (quartz, feldspar, and mica) are visible to the naked eye. Found worldwide in mountainous regions and riverbeds.
