sedimentary
Sandstone (Picture Sandstone)
Arenite (primarily SiO2 with iron oxide impurities)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, brown with layered banding; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, brown with layered banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, beige, brown with layered banding; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains (mostly quartz) in environments such as deserts, river beds, or beaches. The 'picture' banding is caused by rhythmic precipitation of iron and manganese oxides from groundwater over millions of years.
Uses & applications
Used widely in construction as a building stone, in paving, and as decorative tiles. Specific 'picture' varieties are cut into cabochons for jewelry or sold as ornamental 'landscape stones'.
Geological facts
The distinct banding seen in this specimen is often referred to as Liesegang rings. They form beautiful, landscape-like patterns that can mimic mountains or horizons, making it a favorite for 'suiseki' or viewing stones.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering. It is common in arid regions like the American Southwest (e.g., Kanab, Utah) and Australia.
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