igneous
Small weathered rock fragment (likely iron-rich basalt or laterite)
Tentative: basaltic lithic fragment, possibly limonitic/iron-oxide coated
AI-generated identification · may be incorrectDark brown-gray, dull to earthy luster, irregular granular texture, and no visible crystals or cleavage; hardness is likely about 5–6 if basaltic, but the tiny specimen prevents reliable testing. Specific gravity is probably moderate to high, especially if iron-rich.
Identified More igneous →
Explore Small weathered rock fragment (likely iron-rich basalt or laterite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark brown-gray, dull to earthy luster, irregular granular texture, and no visible crystals or cleavage; hardness is likely about 5–6 if basaltic, but the tiny specimen prevents reliable testing. Specific gravity is probably moderate to high, especially if iron-rich.
Formation & geological history
The fragment appears naturally weathered and soil-coated. If basalt, it formed from rapidly cooled mafic lava, commonly during Cenozoic or older volcanic activity; if lateritic, it developed by intense tropical weathering of underlying rock.
Uses & applications
No practical use at this size; larger basalt is used as aggregate, roadstone, and building stone, while iron-rich laterite can be an iron ore or construction material.
Geological facts
The image is insufficient for confident mineral identification because the specimen is very small and partly obscured by dirt. Its brown coloration may come from limonite or other iron oxides rather than the primary rock.
Field identification & locations
Look for fine-grained dark gray interior, weak magnetism, and possible vesicles to support basalt; a rusty porous texture and strong staining suggest laterite. Common in volcanic terrains and deeply weathered tropical soils.
