igneous
Weathered iron-rich stone, possibly hematite-bearing basalt or ironstone
Indeterminate; likely Fe-oxide-rich basalt/ironstone, dominated by hematite (Fe₂O₃) and/or magnetite (Fe₃O₄)
AI-generated identification · may be incorrectDark reddish-brown, dull to weakly metallic luster, fine-grained and heavily weathered with pits and pale mineral crusts; hardness likely about 5–6.5 Mohs, with no visible cleavage. Exact identification requires magnetism, streak, density, and a fresh surface.
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Physical properties
Dark reddish-brown, dull to weakly metallic luster, fine-grained and heavily weathered with pits and pale mineral crusts; hardness likely about 5–6.5 Mohs, with no visible cleavage. Exact identification requires magnetism, streak, density, and a fresh surface.
Formation & geological history
Could be a weathered volcanic fragment or ironstone formed by oxidation and cementation of iron-rich sediments; age and locality cannot be determined from the image.
Uses & applications
Common material has little commercial value, though hematite-rich specimens are collected and used as iron ore, pigment, and occasionally ornamental stone.
Geological facts
A red-brown streak suggests hematite, while a strong magnetic response suggests magnetite or maghemite; surface color alone is not diagnostic.
Field identification & locations
Test streak on unglazed porcelain, magnetism, and specific gravity; inspect a fresh chip for basaltic texture or metallic iron oxides. Similar stones occur worldwide in volcanic terrains and iron-rich soils.
