igneous
Granite Pebble
Granite (composed mainly of Quartz, Feldspar, and Mica)
Hardness: 6-7 on Mohs scale; Color: Salt and pepper (white/grey with dark flecks); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Color
- Salt and pepper (white/grey with dark flecks)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Salt and pepper (white/grey with dark flecks); Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.6-2.7
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specimen has been rounded through weathering and erosional transport, likely by water.
Uses & applications
Crushed granite is used in construction as aggregate for roads and concrete. Large slabs are used for countertops and monuments. Tumbled pebbles are common in landscaping.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Its name comes from the Latin 'granum', meaning a grain, in reference to its coarse-grained structure.
Field identification & locations
Identify by its speckled 'salt and pepper' appearance and its ability to scratch glass. Commonly found in riverbeds, glacial deposits, and mountain ranges. It is an extremely common rock globally.
