sedimentary
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
Hardness: 6-7 (on Mohs scale); Color: Brown, rusty orange, dull grey; Luster: Dull, earthy; Crystal structure: Granular/clastic; Specific gravity: 2.6-3.0
- Hardness
- 6-7 (on Mohs scale)
- Color
- Brown, rusty orange, dull grey
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Brown, rusty orange, dull grey; Luster: Dull, earthy; Crystal structure: Granular/clastic; Specific gravity: 2.6-3.0
Formation & geological history
Formed through the cementation of sand and gravel by iron-rich groundwater over millions of years. Often found in areas with high oxidation and historical water flow.
Uses & applications
Primarily used as decorative gravel, road base in construction, or for low-grade iron ore extraction in some historical contexts.
Geological facts
These are common concretions or eroded fragments often mistaken for meteorites due to their heavy iron staining and dark weathered surface.
Field identification & locations
Identify by the gritty texture (sand grains) and rusty streaks. They are commonly found in stream beds, gardens, and construction sites as fill material.
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