sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan to yellowish-brown with dark iron-oxide banding (Liesegang rings); Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None.
- Hardness
- 6-7 Mohs
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan to yellowish-brown with dark iron-oxide banding (Liesegang rings); Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or marine environments. The dark banding is caused by secondary precipitation of iron-rich fluids.
Uses & applications
Used primarily as a construction material (dimension stone), in glass manufacturing if pure silica, or as a decorative landscaping rock.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The dark curvy lines visible on this specimen are often called 'Liesegang rings', which are secondary chemical precipitates formed during weathering.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and coastal areas. Collectors value specimens with unique aesthetic banding.
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