igneous
Weathered iron-rich rock, possibly limonite-bearing basalt or laterite
Indeterminate; likely Fe-oxide/hydroxide–altered mafic rock, dominated by limonite/goethite with silicate minerals
AI-generated identification · may be incorrectBrown to gray, earthy to dull luster, irregular massive texture, and apparent weathering rind; likely hardness about 4–6, with no visible cleavage. The image is insufficient for reliable mineral identification or density estimation.
Identified More igneous →
Explore Weathered iron-rich rock, possibly limonite-bearing basalt or laterite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Brown to gray, earthy to dull luster, irregular massive texture, and apparent weathering rind; likely hardness about 4–6, with no visible cleavage. The image is insufficient for reliable mineral identification or density estimation.
Formation & geological history
Probably formed by chemical weathering and oxidation of an iron-bearing mafic rock, producing goethite/limonite; exact age and parent rock cannot be determined visually. The surrounding material appears like fractured, weathered rock or rubble.
Uses & applications
Generally used only as ordinary aggregate or iron-rich decorative material; not suitable for jewelry unless it proves to contain attractive crystalline minerals. Collector value is usually minimal.
Geological facts
Rust-brown coloration commonly reflects hydrated iron oxides rather than metallic iron. A streak test, magnet test, hardness test, and fresh-face examination would substantially improve identification.
Field identification & locations
Common in weathered basalt, gossan zones, lateritic soils, and mine waste worldwide. Test the yellow-brown streak, magnetism, reaction to dilute acid, and density; laboratory analysis may be needed.
