sedimentary
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull/earthy; Crystal structure: clastic/granular; Cleavage: none; Specific gravity: approx. 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- reddish-brown
- Luster
- dull/earthy
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Physical properties
Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull/earthy; Crystal structure: clastic/granular; Cleavage: none; Specific gravity: approx. 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, often in desert or riverbed environments. Red coloration indicates iron oxide (hematite) cementation.
Uses & applications
Commonly used in construction as a building stone, for paving, landscaping, and grit for abrasive materials. Higher quality slabs are used as decorative flagstones.
Geological facts
Red sandstone is a primary component of many famous geological formations, such as those in Sedona, Arizona, and the 'Old Red Sandstone' of Great Britain. It has been used as a building material since ancient times.
Field identification & locations
Identify by its gritty, sand-like texture and reddish hue. Common in sedimentary basins worldwide. For collectors, look for ripple marks or cross-bedding indicating ancient water or wind flow.
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