igneous
Weathered brown rock fragment, possibly iron-rich basalt or breccia
Tentatively basaltic rock; exact identification requires testing
AI-generated identification · may be incorrectDark brown-gray, dull to weakly earthy luster, fine-grained and irregularly fractured; likely Mohs hardness about 5–6, with no visible cleavage or large crystals. Iron-oxide weathering may produce the reddish-brown surface.
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Physical properties
Dark brown-gray, dull to weakly earthy luster, fine-grained and irregularly fractured; likely Mohs hardness about 5–6, with no visible cleavage or large crystals. Iron-oxide weathering may produce the reddish-brown surface.
Formation & geological history
Could be an altered volcanic fragment formed from rapidly cooled basaltic lava, later oxidized and weathered at the surface; age and locality cannot be determined from the image.
Uses & applications
Common basalt is used as aggregate, roadstone, ballast, and occasionally decorative stone; this small nondescript fragment has negligible commercial value.
Geological facts
The image does not show diagnostic crystals, layering, vesicles, or fossil structures, so confident species-level identification is not possible from appearance alone.
Field identification & locations
Check streak, magnetism, hardness, density, and a fresh broken surface; basalt commonly leaves a gray streak and may contain tiny magnetic grains. Common worldwide in volcanic regions.
