igneous
Granite (Polished Countertop Surface)
Plutonic Igneous Rock (Felsic)
Hardness: 6-7 on Mohs scale. Color: Dark brown, black, grey, and golden-beige mottling. Luster: Vitreous to dull (scratched surface). Structure: Phaneritic (coarse-grained intrusive texture). Cleavage: Varies by constituent minerals (feldspar shows good cleavage).
- Hardness
- 6-7 on Mohs scale
- Color
- Dark brown, black, grey, and golden-beige mottling
- Luster
- Vitreous to dull (scratched surface)
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Dark brown, black, grey, and golden-beige mottling. Luster: Vitreous to dull (scratched surface). Structure: Phaneritic (coarse-grained intrusive texture). Cleavage: Varies by constituent minerals (feldspar shows good cleavage).
Formation & geological history
Formed through the slow crystallization of magma deep below the Earth's surface (intrusive igneous process), often dating to Precambrian or Paleozoic eras.
Uses & applications
Widely used as architectural stone, kitchen countertops, flooring, and decorative building material due to its durability and resistance to heat.
Geological facts
Granite is composed primarily of quartz, alkali feldspar, and plagioclase, with minor amounts of mica and amphibole minerals. The dark variations are often rich in biotite or hornblende.
Field identification & locations
Identified by its visible, interlocking coarse mineral grains. Found in continental crust boundaries worldwide, such as the Canadian Shield and Appalachian mountain roots. Values for polished slabs range from $40-$100+ per square foot depending on quality and origin.
