Igneous
Granite
Granite
Hardness: 6-7 on Mohs scale. Color: Variable, often grey, pink, or white, characterized by visible coarse grains. Luster: Dull to sub-vitreous. Crystal structure: Phaneritic (coarse-grained). Cleavage: None in the rock itself, though individual minerals (like feldspar) may show cleavage.
- Hardness
- 6-7 on Mohs scale
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Variable, often grey, pink, or white, characterized by visible coarse grains. Luster: Dull to sub-vitreous. Crystal structure: Phaneritic (coarse-grained). Cleavage: None in the rock itself, though individual minerals (like feldspar) may show cleavage.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. Occurs in convergent plate boundaries and continental crust.
Uses & applications
Widely used as a dimension stone in construction, monuments, countertops, paving, and architectural accents due to its durability and aesthetic appeal.
Geological facts
Granite makes up a significant portion of the continental crust. Famous natural formations include Half Dome in Yosemite and Mount Rushmore.
Field identification & locations
Identified by its distinctly visible crystalline texture consisting mainly of quartz, feldspar, and dark minerals like mica or amphibole. Common worldwide in continental shields and mountain ranges. Collectors value unique color variations or large phenocrysts.
