igneous
Granite / Igneous Rock Specimen
Phaneritic Igneous Rock
Hardness: 6-7 on Mohs scale; Color: Mottled gray, greenish, and white; Luster: Vitreous to dull; Crystal structure: Coarse-grained (phaneritic) interlocking crystal texture containing quartz, feldspar, and dark accessory minerals.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled gray, greenish, and white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled gray, greenish, and white; Luster: Vitreous to dull; Crystal structure: Coarse-grained (phaneritic) interlocking crystal texture containing quartz, feldspar, and dark accessory minerals.
Formation & geological history
Formed from the slow cooling of magma beneath the Earth's surface over millions of years, typically associated with continental crust formation.
Uses & applications
Used in construction, monuments, countertops, architectural facing, and as crushed stone for roadbeds.
Geological facts
Granite is the most common rock of the Earth's continental crust and is frequently used as a benchmark for continental stability and geologic mapping.
Field identification & locations
Can be identified in the field by its visible interlocking crystals of quartz, feldspar, and biotite or hornblende. Common in mountainous regions and shield areas globally.
