sedimentary
Banded Sandstone / Quartzite Pebble
Quartzose Arenite with Iron Oxide Banding
Hardness: 7 on the Mohs scale (for quartz-rich parts); Color: Tan, brown, and dark gray-brown with distinctive banding; Luster: Vitreous to dull; Crystal Structure: Microcrystalline quartz matrix; Cleavage: None, fractures conchoidally; Specific Gravity: ~2.65
- Hardness
- 7 on the Mohs scale (for quartz-rich parts)
- Color
- Tan, brown, and dark gray-brown with distinctive banding
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on the Mohs scale (for quartz-rich parts); Color: Tan, brown, and dark gray-brown with distinctive banding; Luster: Vitreous to dull; Crystal Structure: Microcrystalline quartz matrix; Cleavage: None, fractures conchoidally; Specific Gravity: ~2.65
Formation & geological history
Formed through the accumulation, compaction, and cementation of quartz sand grains in ancient environments like beaches, deserts, or riverbeds, often enhanced by groundwater movement depositing iron oxides (Limonite/Hematite) along specific permeability layers to create the visible bands.
Uses & applications
Used primarily as decorative landscaping stones, gravel, in construction aggregates, and collected by rockhounds as river tumbled specimens.
Geological facts
The distinct dark bands are Liesegang rings or iron-staining fronts, which form due to rhythmic chemical precipitation within the porous sandstone during diagenesis.
Field identification & locations
Easily identified by distinct color banding and high hardness (scratches glass). Commonly found in stream beds and glacial till where durable quartz rocks survive long-distance transport.
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Sandstone or Siltstone
Arenite (if sandstone)
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Quartz pebble
Silicon dioxide (SiO2)
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Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
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