igneous
Granite Pebble
Felsic Igneous Rock (Granitic composition)
Hardness: 6-7 Mohs; Color: Mottled tan, gray, and black; Luster: Dull (weathered) to vitreous; Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Mottled tan, gray, and black
- Luster
- Dull (weathered) to vitreous
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled tan, gray, and black; Luster: Dull (weathered) to vitreous; Structure: Phaneritic (coarse-grained); Specific 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 and smoothed by water erosion in a river or coastal environment.
Uses & applications
Landscape decoration, aggregate in construction, or for use in rock tumblers for hobbyists.
Geological facts
Granite is the primary component of the Earth's continental crust. Its durability and hardness make it one of the most common materials found as river rocks.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals of quartz, feldspar, and mica. Commonly found in riverbeds, glacial tills, and mountain streams.
