igneous
Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 on Mohs scale; Color: mottled white, grey, and pinkish-brown; Luster: Vitreous to dull; Crystal structure: Phaneritic (large, visible crystals); Cleavage: Dependent on mineral component (perfect on feldspars).
- Hardness
- 6-7 on Mohs scale
- Color
- mottled white, grey, and pinkish-brown
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: mottled white, grey, and pinkish-brown; Luster: Vitreous to dull; Crystal structure: Phaneritic (large, visible crystals); Cleavage: Dependent on mineral component (perfect on feldspars).
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen appears to be a water-worn or weathered cobble, likely of Paleozoic or Precambrian age depending on regional locality.
Uses & applications
Construction material (countertops, flooring), dimension stone, road base, and common specimen for geological education.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is primarily composed of quartz and feldspar, with minor amounts of mica and amphiboles.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and interlocking crystals of roughly equal size. It is commonly found in mountainous regions or glacial deposits. Its hardness makes it resistant to weathering.
