igneous
Granite (Weathered)
Granite (Felsic Plutonic Rock)
Hardness: 6-7 on Mohs scale; Color: Gray, pink, reddish-brown showing iron oxide staining; Luster: Pearly to Vitreous (when fresh), Dull (when weathered); Structure: Coarse-grained/Phaneritic; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, pink, reddish-brown showing iron oxide staining
- Luster
- Pearly to Vitreous (when fresh), Dull (when weathered)
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, pink, reddish-brown showing iron oxide staining; Luster: Pearly to Vitreous (when fresh), Dull (when weathered); Structure: Coarse-grained/Phaneritic; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specific specimen shows chemical weathering and oxidation (rusting) of iron-bearing minerals like biotite or hornblende.
Uses & applications
Primarily used in construction for crushed stone, road base, and dimension stone for countertops and monuments. Weathered granite is often used as decomposed granite (DG) for walkways.
Geological facts
Granite makes up the majority of Earth's continental crust. Over millions of years, the softer minerals in granite like feldspar weather into clay, while the harder quartz grains become sand.
Field identification & locations
Identify in the field by looking for a 'salt and pepper' appearance with visible interlocking crystals of quartz and feldspar. Found globally in mountainous regions and shields like the Canadian Shield. These weathered samples are common in topsoil and riverbeds.
