igneous
Granite
Phaneritic plutonic rock (SiO2-rich)
Hardness: 6-7 (Mohs). Color: Pink, white, and grey speckled. Luster: Dull (weathered) to vitreous (fresh crystals). Crystal structure: Phaneritic (visible crystals). Cleavage: None (fractures).
- Hardness
- 6-7 (Mohs)
- Color
- Pink, white, and grey speckled
- Luster
- Dull (weathered) to vitreous (fresh crystals)
Identified More igneous →
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Physical properties
Hardness: 6-7 (Mohs). Color: Pink, white, and grey speckled. Luster: Dull (weathered) to vitreous (fresh crystals). Crystal structure: Phaneritic (visible crystals). Cleavage: None (fractures).
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. This specimen appears to be a stream-rounded or glacial cobble, likely millions to billions of years old.
Uses & applications
Used extensively in construction for countertops, floor tiles, paving stones, and memorial monuments due to its durability.
Geological facts
Granite makes up much of the Earth's continental crust. The pink color in this specific specimen is caused by the presence of potassium feldspar (orthoclase).
Field identification & locations
Identify by its interlocking 'salt and pepper' appearance of quartz, feldspar, and mica. Commonly found in mountainous regions or as glacial erratic stones in riverbeds.
