igneous
Granite (Weathered)
Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, and grey with rusty iron oxidation; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: None in the rock itself, though feldspar grains show 2 planes.
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, and grey with rusty iron oxidation
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, and grey with rusty iron oxidation; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained visible crystals); Cleavage: None in the rock itself, though feldspar grains show 2 planes.
Formation & geological history
Formed from the slow subterranean cooling of silica-rich magma (plutonic). This specific specimen shows chemical weathering and iron oxidation, typical of exposure to water and oxygen in surface environments.
Uses & applications
Used extensively in construction as dimension stone, countertops, road aggregate, and for monuments due to its durability.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Over time, the feldspar in granite can weather into kaolinite clay.
Field identification & locations
Identify in the field by visually spotting clear quartz grains, opaque feldspar, and dark speckles of mica or hornblende. Commonly found in mountain ranges or Shield areas like the Canadian Shield.
