igneous
Granite
Felsic intrusive igneous rock
Hardness: 6 on the Mohs scale. Color: Varies widely (pink, gray, white) with dark mineral specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible crystals of quartz, feldspar, and mica). Specific gravity: 2.65 - 2.75.
- Hardness
- 6 on the Mohs scale
- Color
- Varies widely (pink, gray, white) with dark mineral specks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 on the Mohs scale. Color: Varies widely (pink, gray, white) with dark mineral specks. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible crystals of quartz, feldspar, and mica). Specific gravity: 2.65 - 2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma rich in silica and alkali metal oxides beneath the Earth's surface over millions of years.
Uses & applications
Widely used in construction for countertops, floor tiles, curbing, monuments, and building facades.
Geological facts
Granite makes up a major part of the Earth's continental crust and is exceptionally durable against weathering.
Field identification & locations
Easily identified by its speckled appearance and visible interlocking crystals of quartz and feldspar. Found worldwide in continental shields and mountain roots.
