igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 on Mohs scale; Color: typically mottled grey, white, pink, or tan; Luster: vitreous to dull; Crystal structure: coarse-grained holocrystalline; Cleavage: none (irregular fracture); Specific gravity: 2.63 - 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- typically mottled grey, white, pink, or tan
- Luster
- vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: typically mottled grey, white, pink, or tan; Luster: vitreous to dull; Crystal structure: coarse-grained holocrystalline; Cleavage: none (irregular fracture); Specific gravity: 2.63 - 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. Granite is part of the continental crust and can range in geological age from the Archean Eon to the Cenozoic Era, often revealed through tectonic uplift and erosion.
Uses & applications
Larger deposits are used for construction, countertops, monuments, and paving. Small pebbles are often used in landscaping, as road aggregate, or in concrete production.
Geological facts
Granite is the most common igneous rock found on Earth's continents and makes up the core of many mountain ranges. It is the rock that famously forms the climbing walls of Yosemite National Park (El Capitan).
Field identification & locations
Identify in the field by its 'salt and pepper' appearance caused by interlocking crystals of quartz, feldspar, and mica. It is found globally in continental crust/mountainous regions. Collectors look for unique color variations or large crystal 'porphyritic' textures.
