igneous
Granite Pebble
Granite (Plutonic Igneous Rock)
AI-generated identification · may be incorrectHardness: 6-7 on the Mohs scale. Color: Pale grey to pinkish with visible speckled grains of quartz, feldspar, and dark minerals like mica or amphibole. Luster: Dull to pearly/vitreous on mineral faces. Structure: Phaneritic (medium- to coarse-grained interlocked crystals).
- Hardness
- 6-7 on the Mohs scale
- Luster
- Dull to pearly/vitreous on mineral faces
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Physical properties
Hardness: 6-7 on the Mohs scale. Color: Pale grey to pinkish with visible speckled grains of quartz, feldspar, and dark minerals like mica or amphibole. Luster: Dull to pearly/vitreous on mineral faces. Structure: Phaneritic (medium- to coarse-grained interlocked crystals).
Formation & geological history
Formed deep underground by the slow cooling and crystallization of silica-rich magma (plutonic environment). This smooth, rounded pebble shape was created through natural erosion and weathering by water or glacial action.
Uses & applications
Granite is widely used as a construction material, dimension stone, countertops, and crushed stone for roads. Small pebbles are used in landscaping or decorative gravel.
Geological facts
Granite makes up a large portion of Earth's continental crust. Over millions of years, tectonic uplift brings granite to the surface where rivers, waves, or glaciers erode it into rounded beach and river pebbles.
Field identification & locations
Look for a salt-and-pepper or pinkish speckled texture with visible interlocking mineral grains that cannot be easily scratched with a steel pocket knife. Very common along riverbeds, beaches, and glacial till worldwide.
