igneous
Weathered iron-rich rock (likely basalt or ironstone)
Probable altered basalt; exact identification requires testing
AI-generated identification · may be incorrectDark brown to reddish-brown, dull earthy luster, fine-grained and massive, with rusty iron-oxide staining; likely Mohs hardness about 5–6 and specific gravity roughly 2.8–3.5. No visible cleavage or distinct crystals are apparent.
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Physical properties
Dark brown to reddish-brown, dull earthy luster, fine-grained and massive, with rusty iron-oxide staining; likely Mohs hardness about 5–6 and specific gravity roughly 2.8–3.5. No visible cleavage or distinct crystals are apparent.
Formation & geological history
Could be an iron-oxidized basaltic volcanic rock, formed from lava millions to billions of years ago and later altered by groundwater and weathering. Its appearance alone cannot establish a precise geological age.
Uses & applications
Usually a common collecting specimen with little commercial value; comparable basalt is used as aggregate, roadstone, and construction material.
Geological facts
The reddish-brown color commonly comes from hematite and goethite coatings or alteration. It does not show diagnostic meteorite features such as a clear fusion crust, metal flakes, or strongly elevated density.
Field identification & locations
Common in volcanic and iron-rich terrains worldwide. Test with a magnet, streak it on unglazed ceramic, inspect a fresh broken surface, and check density; a strong metallic streak or unusual weight would suggest a different material.
