mineral

Likely weathered iron-rich rock fragment

Indeterminate; possibly limonite/goethite-bearing sandstone or ironstone

AI-generated identification · may be incorrect

Small brown, irregular, earthy to submetallic fragment with granular texture; likely Mohs hardness about 4–6, but the image cannot establish cleavage, crystal structure, or specific gravity.

Identified September 13, 2026More mineral →

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Physical properties

Small brown, irregular, earthy to submetallic fragment with granular texture; likely Mohs hardness about 4–6, but the image cannot establish cleavage, crystal structure, or specific gravity.

Formation & geological history

Probably formed by weathering and oxidation of iron-bearing minerals, producing limonite/goethite coatings or cement; age and exact geological setting are undetermined.

Uses & applications

Usually a common geological curiosity or specimen; ironstone and iron-rich sandstone may be used as minor construction aggregate or iron ore, but this fragment has no evident commercial value.

Geological facts

Brown iron oxides commonly produce rusty red, yellow-brown, or dark-brown coloration and may leave a yellow-brown streak.

Field identification & locations

Test streak on unglazed porcelain, magnetism, hardness, and reaction to dilute acid; a precise identification requires a larger sample or laboratory analysis. Common in soils, weathered outcrops, stream gravels, and mining areas.