igneous
Weathered iron-rich rock, likely laterite or vesicular scoria
Probably iron-oxide-stained basaltic scoria; exact identification requires testing
AI-generated identification · may be incorrectDark reddish-brown, earthy to dull luster, highly vesicular with irregular cavities and rough granular texture. Likely hardness about 5–6 if basaltic, but porous weathering can make surfaces friable; cleavage absent and specific gravity variable, commonly about 2.2–3.0.
Identified More igneous →
Explore Weathered iron-rich rock, likely laterite or vesicular scoria in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark reddish-brown, earthy to dull luster, highly vesicular with irregular cavities and rough granular texture. Likely hardness about 5–6 if basaltic, but porous weathering can make surfaces friable; cleavage absent and specific gravity variable, commonly about 2.2–3.0.
Formation & geological history
Probably formed as gas-rich basaltic lava cooled rapidly, leaving vesicles later enlarged or accentuated by weathering and iron-oxide staining. Such material is generally geologically young in volcanic settings, though the photograph cannot establish age.
Uses & applications
Used locally as lightweight aggregate, drainage or landscaping stone; intact attractive pieces may be collected, but it has little jewelry value.
Geological facts
The reddish color commonly reflects hematite and limonite. The cavities are vesicles, not crystal cleavage or fossil pores, although strongly weathered laterite can look similar.
Field identification & locations
Look for a very light, porous volcanic texture, magnetism from iron-bearing minerals, and a dark gray-black fresh interior beneath the rusty surface. Common around volcanic fields; test with a steel knife and streak on unglazed ceramic, while noting that a definitive ID needs density, magnetism, and fresh-break examination.
