igneous
Granite Pebble
Phaneritic intrusive igneous rock
Hardness: 6-7 on Mohs scale; Color: mottled tan, pink, and grey with black flecks; Luster: dull to vitreous; Structure: phaneritic (visible crystals); Cleavage: none (irregular fracture in aggregate).
- Hardness
- 6-7 on Mohs scale
- Color
- mottled tan, pink, and grey with black flecks
- Luster
- dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: mottled tan, pink, and grey with black flecks; Luster: dull to vitreous; Structure: phaneritic (visible crystals); Cleavage: none (irregular fracture in aggregate).
Formation & geological history
Formed by the slow cooling of silica-rich magma deep beneath the Earth's surface. This specimen has been rounded by fluvial or glacial erosion.
Uses & applications
Large-scale use in construction, countertops, and monuments; small pebbles are used for landscaping and drainage.
Geological facts
Granite makes up the majority of the Earth's continental crust. It is one of the hardest and most durable common stones, frequently surviving millions of years of erosion.
Field identification & locations
Identify by the presence of interlocking quartz and feldspar crystals with scattered dark minerals like mica. Found globally in mountainous regions and riverbeds.
