sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
Hardness: 6-7 on Mohs scale; Color: Dark brown to reddish; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Dark brown to reddish
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Dark brown to reddish; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in river, desert, or marine environments. The dark color suggests iron oxide mineralization.
Uses & applications
Commonly used in construction for paving, building facades, and as an ornamental stone. Also used as a material for sharpening tools due to its abrasive texture.
Geological facts
Sandstone makes up about 10-25% of all sedimentary rocks found on Earth. It often stores vast reservoirs of groundwater, oil, and natural gas within its porous structure.
Field identification & locations
Identified by its gritty sandpaper-like feel. It is commonly found in sedimentary basins and cliffs. For collectors, it is often gathered for its unique textures or sedimentary structures like cross-bedding.
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