sedimentary
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
Hardness: 6-7 (Mohs); Color: Tan, beige, and rusty orange; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None/Massive; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige, and rusty orange
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige, and rusty orange; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None/Massive; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. The orange-brown discoloration (Liesegang rings or staining) is caused by iron oxides like hematite or goethite precipitating from groundwater.
Uses & applications
Primarily used as construction material, paving stones, and for ornamental masonry. In industry, high-purity sandstones are used for glassmaking.
Geological facts
Sandstone can preserve fossil footprints and ripple marks from ancient environments. The iron staining often creates intricate, flame-like patterns known as Liesegang bands which are highly aesthetic.
Field identification & locations
Identified by its gritty feel and visible sand grains. Found globally in ancient riverbeds, deserts, and coastlines. Collectors look for unique iron banding patterns or fossil inclusions.
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