igneous
Dark mafic rock, possibly basalt or meteorite-like specimen
Likely basalt (plagioclase–pyroxene assemblage); meteorite identification cannot be confirmed visually
AI-generated identification · may be incorrectDark gray, fine- to medium-grained, dull to slightly submetallic surface; typical basalt hardness is about 6 Mohs, with no obvious cleavage and specific gravity near 2.8–3.0. The photo is insufficient to establish mineral composition or metallic iron.
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Physical properties
Dark gray, fine- to medium-grained, dull to slightly submetallic surface; typical basalt hardness is about 6 Mohs, with no obvious cleavage and specific gravity near 2.8–3.0. The photo is insufficient to establish mineral composition or metallic iron.
Formation & geological history
If basalt, it formed from rapidly cooled mafic lava, commonly in volcanic flows and oceanic crust, ranging from ancient to modern ages. A meteorite would instead be extraterrestrial and often show fusion crust, metallic flecks, and unusually high density.
Uses & applications
Basalt is used as crushed aggregate, roadstone, building stone, and occasionally as a specimen. Confirmed meteorites may have significant collector value.
Geological facts
The irregular dark piece could also be slag, iron-rich rock, or a weathered meteorite; a photo alone cannot reliably distinguish these. A strong magnet, streak, density, and laboratory elemental tests are useful.
Field identification & locations
Check for vesicles, visible plagioclase crystals, a gray-black streak, and ordinary basalt-like weight; meteorite candidates commonly attract a magnet and show metal flecks or fusion crust. Common basalt localities are volcanic regions worldwide.
