igneous
Crushed Granite and Basalt
Phaneritic Igneous Rock / Aphanitic Igneous Rock
Hardness: 6-7 (Mohs); Color: Gray, light pink, black; Luster: Dull to earthy; Texture: Granular to fine-grained; Composition: Quartz, feldspar, mica, or pyroxene.
- Hardness
- 6-7 (Mohs)
- Color
- Gray, light pink, black
- Luster
- Dull to earthy
Identified More igneous →
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Physical properties
Hardness: 6-7 (Mohs); Color: Gray, light pink, black; Luster: Dull to earthy; Texture: Granular to fine-grained; Composition: Quartz, feldspar, mica, or pyroxene.
Formation & geological history
Formed from the cooling and solidification of molten rock (magma or lava). Granite forms underground through slow cooling (intrusive), while basalt or light-colored igneous rocks may form closer to the surface.
Uses & applications
Used widely in construction as road base, landscaping gravel, railroad ballast, and concrete aggregate.
Geological facts
Granite is the most common rock found in the Earth's continental crust. Basalt is the most common rock on the ocean floor and also exists on the Moon and Mars.
Field identification & locations
Identify in the field by their interlocking mineral grains (granite) or dense, dark, heavy mass (basalt). These are common 'river rocks' or landscaping stones found globally.
