igneous
Granite Gravel / Pebbles
Granite (Plutonic Igneous Rock)
Hardness: 6-7 on Mohs scale. Color: Pink, reddish-brown, grey, white, black. Luster: Vitreous to dull. Texture: Phaneritic (coarse-grained). Composition: Quartz, potassium feldspar, plagioclase feldspar, and biotite mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, reddish-brown, grey, white, black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Pink, reddish-brown, grey, white, black. Luster: Vitreous to dull. Texture: Phaneritic (coarse-grained). Composition: Quartz, potassium feldspar, plagioclase feldspar, and biotite mica.
Formation & geological history
Formed by the slow crystallization of felsic magma beneath the Earth's surface in plutonic environments over millions of years.
Uses & applications
Commonly used in construction, road base, aggregate, landscaping gravel, decorative stone, and countertops.
Geological facts
Granite makes up a large portion of the Earth's continental crust and is one of the most abundant intrusive igneous rocks.
Field identification & locations
Can be identified in the field by its interlocking, visible crystals of quartz (glassy), feldspar (pink/white), and biotite/hornblende (dark spots). Found abundantly worldwide.
