igneous
Granite Pebble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
Hardness: 6-7 on the Mohs scale, Color: Mottled gray, black, and white, Luster: Vitreous to dull, Crystal Structure: Phanritic (coarse-grained), Cleavage: Varies by mineral component, Specific Gravity: 2.65 - 2.75
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Physical properties
Hardness: 6-7 on the Mohs scale, Color: Mottled gray, black, and white, Luster: Vitreous to dull, Crystal Structure: Phanritic (coarse-grained), Cleavage: Varies by mineral component, Specific Gravity: 2.65 - 2.75
Formation & geological history
Formed from the slow cooling of magma rich in silica and alkali metals far beneath the Earth's surface. Geological age varies widely from Precambrian to Cenozoic.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and as small specimens for rock tumbling or beginner collections.
Geological facts
Granite is the most common intrusive rock in the Earth's continental crust and is famous for its durability and resistance to weathering.
Field identification & locations
Easily identified by its distinct salt-and-pepper or speckled appearance due to the interlocked crystals of light quartz and feldspar mixed with dark biotite mica or amphibole. Found globally in mountainous regions and riverbeds.
