sedimentary
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
Hardness: 6.5-7 (Mohs); Color: Tan, yellowish-brown, or rusty orange due to iron oxidation; Luster: Dull to earthy; Crystal Structure: Clastic grains; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6
- Color
- Tan, yellowish-brown, or rusty orange due to iron oxidation
- Luster
- Dull to earthy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, yellowish-brown, or rusty orange due to iron oxidation; Luster: Dull to earthy; Crystal Structure: Clastic grains; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specimen shows significant weathering and iron oxide staining from exposure to moisture and oxygen.
Uses & applications
Used primarily as a construction material, for road base, or as architectural decorative stone. Highly weathered specimens like this are mostly of interest to hobbyist collectors or used in landscaping.
Geological facts
Sandstone can preserve fossil records and is a major reservoir for groundwater, oil, and natural gas due to its porosity.
Field identification & locations
Identified by its gritty 'sandpaper' texture and visible layering if present. Can be found in riverbeds, deserts, and coastal areas worldwide. Look for the granular surface composed of quartz or feldspar grains.
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