igneous
Granite Sand and Gravel Mix
Phaneritic Felsic Igneous Plutonic Assemblage
Hardness: 6-7 Mohs; Color: Pink, white, gray, and black speckles; Luster: Vitreous to dull; Crystal structure: Coarse-grained phaneritic; Cleavage: Variable; Specific gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, white, gray, and black speckles
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, white, gray, and black speckles; Luster: Vitreous to dull; Crystal structure: Coarse-grained phaneritic; Cleavage: Variable; Specific gravity: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. These specific fragments are likely the result of mechanical weathering and crushing for use in infrastructure.
Uses & applications
Primarily used in construction, road base, concrete aggregate, and landscaping. Small gravel size is ideal for drainage and driveway surfacing.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The pink color in some of these fragments is due to Potassium Feldspar (Orthoclase).
Field identification & locations
Look for a salt-and-pepper appearance with visible interlocking crystals. It is found globally in mountainous regions and used as a standard building material. In the field, it is harder than steel and won't scratch easily.
