sedimentary
Banded Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily Quartzite and Feldspar grains)
Hardness: 6-7 on Mohs scale; Color: Tan, beige, and grey horizontal banding; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.3-2.6
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, beige, and grey horizontal banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, beige, and grey horizontal banding; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.3-2.6
Formation & geological history
Formed through the accumulation and cementation of mineral particles (lithification) in ancient riverbeds or marine environments; subsequently weathered into a smooth pebble by water erosion (alluvial action).
Uses & applications
Commonly used as decorative landscaping stone, in construction aggregates, or as tumbled stones for hobbyist collectors.
Geological facts
The distinct banding represents different layers of sediment deposition over time, which can correspond to seasonal changes or varying environmental conditions during the rock's formation millions of years ago.
Field identification & locations
Identify in the field by its distinct visible layers (bedding planes) and grainy texture. Commonly found in riverbeds, beaches, and glacial till. Collectors look for unique rhythmic banding patterns.
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