igneous
Granite (Weathered)
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: Mottled salt-and-pepper (pink, white, grey, and black); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained) crystalline; Specific gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled salt-and-pepper (pink, white, grey, and black)
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled salt-and-pepper (pink, white, grey, and black); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained) crystalline; Specific gravity: 2.63 to 2.75.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specimen shows a rounded shape and yellowish-brown oxidation, indicating it was likely weathered in a riverbed or soil for a significant period. Ages can range from Precambrian to Cenozoic.
Uses & applications
Used extensively as a construction material (dimension stone), countertops, flooring, and as crushed stone for road base. Weathered specimens are often used in landscaping for a 'natural' rustic look.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Because it is so hard and durable, it was the preferred stone for ancient Egyptian monuments and obelisks.
Field identification & locations
Identify in the field by its visible interlocking crystals of varied colors and its high resistance to scratching. This specific specimen's 'rusty' staining is due to the oxidation of iron-bearing minerals like biotite or hornblende. Commonly found in mountainous regions or glacial till.
