igneous
Granite Pebble
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
Hardness: 6-7 on Mohs scale; Color: mottled grey, white, and tan; Luster: vitreous to dull; Crystal structure: phaneritic (visible crystals); Cleavage: none (irregular fracture); Specific Gravity: 2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Color
- mottled grey, white, and tan
- Luster
- vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: mottled grey, white, and tan; Luster: vitreous to dull; Crystal structure: phaneritic (visible crystals); Cleavage: none (irregular fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface. This specific specimen has been polished smooth by water erosion (fluvial or beach action).
Uses & applications
Commonly used in construction, road base, landscaping, and as decorative river stones. High-quality granite is used for countertops and monuments.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most durable common substances on the planet.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals of different minerals. Frequently found in riverbeds, glacial deposits, and mountain ranges.
