sedimentary
Banded Sandstone
Arenite with iron oxide banding
Hardness: 6-7 (Mohs); Color: Tan, beige with brown/reddish horizontal bands; Luster: Dull or earthy; Crystal structure: Clastic (grainy); Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige with brown/reddish horizontal bands
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige with brown/reddish horizontal bands; Luster: Dull or earthy; Crystal structure: Clastic (grainy); Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and compaction of mineral particles or rock fragments, typically sand-sized grains of quartz. The banding represents seasonal deposition cycles or fluctuations in groundwater chemistry depositing iron oxides.
Uses & applications
Commonly used in construction, landscaping, and as a decorative stone. It is a source of silica for glassmaking.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The distinct banding seen here is often referred to as Liesegang rings if they are chemical in origin, though these look like primary bedding planes.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering. It is found globally in ancient riverbeds, deserts, and coastlines. Collectors look for unique color patterns and fossils.
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