igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
Hardness: 6-7 Mohs; Color: Salt and pepper appearance with pink/white feldspar and gray quartz; Luster: Dull (weathered) to Vitreous (internal); Structure: Phaneritic (coarse-grained); Cleavage: None for whole rock, but individual feldspar grains show 2 planes.
- Hardness
- 6-7 Mohs
- Luster
- Dull (weathered) to Vitreous (internal)
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper appearance with pink/white feldspar and gray quartz; Luster: Dull (weathered) to Vitreous (internal); Structure: Phaneritic (coarse-grained); Cleavage: None for whole rock, but individual feldspar grains show 2 planes.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specific specimen has been anthropogenically or naturally rounded by water erosion in a river, beach, or glacial environment. Geological age ranges from Precambrian to Cenozoic.
Uses & applications
Used extensively in construction (slabs, gravel, dimension stone), monument carving, and as high-durability kitchen countertops. Small river pebbles like this are used in landscaping and aquarium decor.
Geological facts
Granite makes up the majority of Earth's continental crust. It is one of the hardest and most resistant common rocks, which is why it remains as rounded pebbles even after softer rocks have eroded away.
Field identification & locations
Identify in the field by its 'salt and pepper' grainy texture where distinct mineral crystals (pink/white/white/black) can be seen with the naked eye. It will not be scratched by a steel knife. Found globally in mountainous regions and glacial till.
