sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
Hardness: 6-7 on Mohs scale (due to silica cement); Color: Tan, brown, gray, and buff bands; Luster: Dull to earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale (due to silica cement)
- Color
- Tan, brown, gray, and buff bands
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale (due to silica cement); Color: Tan, brown, gray, and buff bands; Luster: Dull to earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deltas, or desert environments. The banding reflects changes in mineral concentration or grain size during deposition.
Uses & applications
Used primarily as a construction material, architectural stone, and for decorative landscaping. Quality specimens are popular for lapidary work and rock tumbling.
Geological facts
The banding, often called 'Liesegang rings' or bedding planes, tells a story of ancient environmental changes. Sandstone makes up about 10 to 20 percent of the sedimentary rocks on Earth.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering. Commonly found in riverbeds, beaches, and canyon walls. Collectors look for unique high-contrast banding patterns.
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