igneous
Granite / Quartz with Mica inclusion
Granite (Plutonic Igneous Rock)
Hardness: 6-7 on Mohs scale; Color: White to off-white with dark black specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- White to off-white with dark black specks
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: White to off-white with dark black specks; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 - 2.75
Formation & geological history
Forms from the slow crystallization of magma below the Earth's surface. Composed primarily of quartz, feldspar, and dark ferromagnesian minerals like biotite mica or hornblende.
Uses & applications
Widely used in construction, crushed stone for road aggregate, countertops, monuments, and decorative gravel.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is extremely durable and resistant to weathering.
Field identification & locations
Look for a granular texture with distinct interlocked light-colored (quartz/feldspar) and dark-colored (biotite/amphibole) mineral grains. Extremely common in gravel driveways, riverbeds, and mountainous regions.
