igneous
Granite Gravel / Crushed Granite
Plutonic Felsic Igneous Rock
Hardness: 6-7 on Mohs scale; Color: light gray, mottled white and black/pinkish; Luster: dull to earthy on broken surfaces, vitreous on fresh mineral grains; Crystal structure: coarse-grained Phaneritic, crystalline mixture of quartz, feldspar, and mica; Cleavage: uneven fracture.
- Hardness
- 6-7 on Mohs scale
- Color
- light gray, mottled white and black/pinkish
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: light gray, mottled white and black/pinkish; Luster: dull to earthy on broken surfaces, vitreous on fresh mineral grains; Crystal structure: coarse-grained Phaneritic, crystalline mixture of quartz, feldspar, and mica; Cleavage: uneven fracture.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive igneous rock). Common in continental crust and mountain belts worldwide, ranging from millions to billions of years old.
Uses & applications
Widely used as construction aggregate, road base, gravel driveways, concrete ingredient, railroad ballast, and landscaping stone.
Geological facts
Granite makes up the majority of Earth's continental crust. It is exceptionally durable and resistant to weathering, which makes crushed granite one of the most common construction materials on Earth.
Field identification & locations
Identified by its medium-to-coarse interlocking crystalline texture containing visible speckles of quartz, feldspar, and dark minerals like biotite. Commonly found in gravel beds, driveways, and quarry sites.
