sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeO oxides)
Hardness: 6-7 (Mohs scale); Color: Grayish-green with brown/orange oxidation; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None
- Hardness
- 6-7 (Mohs scale)
- Color
- Grayish-green with brown/orange oxidation
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Grayish-green with brown/orange oxidation; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. The iron staining (oxidation) occurs through exposure to oxygen and water over geological time.
Uses & applications
Common varieties are used in construction, paving, and glass manufacturing; smooth river-worn specimens like this are often kept as decorative 'pocket stones'.
Geological facts
This specimen appears to be 'water-worn,' meaning its rounded shape was created by the abrasive action of a river, stream, or beach environment.
Field identification & locations
Identify in the field by its gritty texture and the presence of visible sand grains. These are commonly found in dry creek beds, river banks, and ancient sedimentary basins.
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