igneous
Granite Pebble
Granite (High-silica plutonic rock)
Hardness: 6-7 Mohs; Color: Mottled gray, pink, and black; Luster: Dull (weathered) to vitreous (on fresh surfaces); Crystal structure: Phaneritic (coarse-grained crystals of quartz, feldspar, and mica); Sp.Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Mottled gray, pink, and black
- Luster
- Dull (weathered) to vitreous (on fresh surfaces)
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled gray, pink, and black; Luster: Dull (weathered) to vitreous (on fresh surfaces); Crystal structure: Phaneritic (coarse-grained crystals of quartz, feldspar, and mica); Sp.Gravity: 2.63-2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This specific specimen has been rounded by mechanical weathering in a high-energy environment like a river or beach.
Uses & applications
Used primarily as decorative aggregate, in landscaping, and as a durable material for construction and countertops in larger formats.
Geological facts
Granite makes up much of the Earth's continental crust. Over millions of years, tectonic uplift and erosion expose these deep-seated rocks at the surface.
Field identification & locations
Identify by its 'salt and pepper' appearance and interlocking crystals. Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
