igneous
Granite (Phaneritic Igneous Rock)
Granite
Hardness: 6-7 on Mohs scale; Color: Grey with speckled white and dark minerals; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Grey with speckled white and dark minerals
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Grey with speckled white and dark minerals; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Indistinct; Specific Gravity: 2.63 - 2.75.
Formation & geological history
Formed from the slow cooling and crystallization of magma beneath the Earth's surface (intrusive). This specific specimen appears water-worn, suggesting a river or glacial transport history.
Uses & applications
Construction (countertops, flooring, monuments), landscaping, and industrial abrasives. In this rounded form, it is often used for decorative landscaping or river rock features.
Geological facts
Granite makes up a large part of the continental crust. It is one of the hardest and most durable common stones, which is why it has been used in architecture since Ancient Egyptian times.
Field identification & locations
Identify by its interlocking 'mosaic' of different colored minerals (quartz, feldspar, and mica/amphibole). It is found globally in mountainous regions and shield areas.
