igneous
Granite
Phaneritic Igneous Rock (Granitic)
Hardness: 6-7 on Mohs scale; Color: Pink/orange (Potassium Feldspar), White/grey (Quartz), Black (Biotite/Mica); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained coarse crystalline); No cleavage in bulk rock.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink/orange (Potassium Feldspar), White/grey (Quartz), Black (Biotite/Mica); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained coarse crystalline); No cleavage in bulk rock.
Formation & geological history
Formed from the slow cooling of magma deep beneath the Earth's surface (plutonic). The specified specimen's minerals formed millions of years ago through intrusive crystallization.
Uses & applications
Extensively used in construction for countertops, floor tiles, and monuments. Polished specimens are often used for decorative purposes or as landscaping stones.
Geological facts
Granite makes up the majority of the Earth's continental crust. Mount Rushmore is carved into a massive granite batholith. It is one of the hardest and most durable common stones on Earth.
Field identification & locations
Identify by its 'salt and pepper' appearance with visible crystals of different colors. It is commonly found in mountainous regions or as water-worn pebbles in riverbeds. For collectors, look for high potassium feldspar content which gives it a unique pink or salmon hue.
