igneous
Granite
Granite
Hardness: 6-7 Mohs; Color: mottled grey, tan, and brown; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
- Hardness
- 6-7 Mohs
- Color
- mottled grey, tan, and brown
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: mottled grey, tan, and brown; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. These specimens are intrusive igneous rocks likely from the Phanerozoic eon.
Uses & applications
Used primarily as decorative building stone, veneer, and construction material for walls and landscaping.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The stones in the wall show a variety of mineral inclusions including quartz, feldspar, and mica.
Field identification & locations
Identified by its visible interlocking crystals and lack of foliation. Commonly found in mountainous regions and shield areas.
