igneous
Granite Pebble
Felsic Plutonic Rock
Hardness: 6-7 (Mohs scale), Color: Mottled pink, white, gray and black, Luster: Dull/Greasy (weathered), Crystal Structure: Phaneritic (coarse grained), Cleavage: None, Specific Gravity: 2.63 - 2.75
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled pink, white, gray and black, Luster: Dull/Greasy (weathered), Crystal Structure: Phaneritic (coarse grained), Cleavage: None, Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed through the slow cooling and crystallization of magma beneath the Earth's surface during the Precambrian or subsequent eras, later eroded into a river pebble.
Uses & applications
Crushed stone for road construction, architectural stone/countertops, landscaping, and aggregate for concrete.
Geological facts
Granite is the primary constituent of the Earth's continental crust. Because it is highly resistant to weathering, it often survives as rounded pebbles in fluvial or glacial deposits.
Field identification & locations
Identify by its interlocking 'salt and pepper' appearance of quartz, feldspar, and mica. Commonly found in riverbeds, glacial moraines, and mountains. Tips: Look for distinct pink (potassium feldspar) or white grains.
