sedimentary

Ferruginous Sandstone (Ironstone Conglomerate fragments)

Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)

AI-generated identification · may be incorrect

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

Identified April 12, 2026More sedimentary →

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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.