sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (SiO2 with iron oxides)
Hardness: 6-7 (Mohs scale), Color: Tan to reddish-brown with dark banding, Luster: Dull/Earthy, Texture: Granular, Clastic, Porous
- Luster
- Dull/Earthy, Texture: Granular, Clastic, Porous
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Tan to reddish-brown with dark banding, Luster: Dull/Earthy, Texture: Granular, Clastic, Porous
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments of sand size. The dark band represents a concentrated layer of iron oxide (hematite or goethite) or manganese minerals precipitated by groundwater.
Uses & applications
Commonly used in construction, landscaping, and as a decorative stone. High-quality sandstone is used for grindstones and glass manufacture.
Geological facts
Sandstone makes up about 10 to 20 percent of all sedimentary rocks on Earth. The distinct banding is often called Liesegang rings when it forms in concentric patterns.
Field identification & locations
Identified in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and ancient riverbeds. To verify, check if it can scratch glass (due to quartz content).
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