igneous
Granite
Granite (interlocking crystals of quartz, feldspar, and mica)
Hardness: 6-7 Mohs; Color: Light grey with dark flecks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 - 2.75
- Hardness
- 6-7 Mohs
- Color
- Light grey with dark flecks
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Light grey with dark flecks; Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. It is a plutonic rock typical of continental crust, often maturing over millions of years.
Uses & applications
Extensively used in construction, countertops, monuments, paving, and as decorative gravel. It is highly valued for its durability and resistance to weathering.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest natural substances and was used by ancient Egyptians to build pyramids and obelisks.
Field identification & locations
Identified by its speckled salt-and-pepper appearance and visible individual mineral grains. It is commonly found in mountainous regions or areas where ancient bedrock is exposed.
