igneous
Granite Gravel (Pebble)
Intrusive Felsic Igneous Rock
Hardness: 6-7 on Mohs scale; Color: Gray, tan, white, and black mottled appearance; Luster: Dull to vitreous; Texture: Phaneritic (coarse-grained); Composition: Quartz, feldspar, and biotite mica
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, tan, white, and black mottled appearance
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, tan, white, and black mottled appearance; Luster: Dull to vitreous; Texture: Phaneritic (coarse-grained); Composition: Quartz, feldspar, and biotite mica
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface over millions of years. This small specimen has been weathered and eroded into a small angular pebble or gravel fragment.
Uses & applications
Commonly used as construction aggregate, driveway gravel, landscaping stone, and concrete mixture ingredient.
Geological facts
Granite makes up a large portion of Earth's continental crust. Small pebbles like this are formed through natural weathering or mechanical crushing for industrial aggregate.
Field identification & locations
Identified by its visible interlocking mineral grains of light quartz/feldspar and dark mica/amphibole. Found globally in continental crust and gravel beds.
