mineral
Weathered iron-rich rock, possibly hematite-bearing jasper
Hematite (Fe₂O₃) with quartz/chalcedony and iron-oxide minerals
AI-generated identification · may be incorrectDark brown to black, rusty red-orange patches, vitreous to earthy luster, and irregular massive texture; hematite has Mohs hardness 5–6.5, no cleavage, and high specific gravity (~5.3), though the mixed specimen is variable.
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Physical properties
Dark brown to black, rusty red-orange patches, vitreous to earthy luster, and irregular massive texture; hematite has Mohs hardness 5–6.5, no cleavage, and high specific gravity (~5.3), though the mixed specimen is variable.
Formation & geological history
Likely formed through silica-rich fluid deposition and oxidation of iron minerals, producing jasper/chalcedony with hematite or limonite staining; its exact geological age and locality cannot be determined from the photograph.
Uses & applications
Common material is used as an iron ore, pigment, lapidary rough, and decorative stone; attractive pieces may be polished for display, but this specimen appears primarily collectible rather than gem-quality.
Geological facts
A reddish-brown streak on unglazed porcelain strongly supports hematite or limonite; metallic hematite commonly feels unusually heavy for its size.
Field identification & locations
Look for a dense dark matrix, red-brown streak, and rusty coatings; common sources include Brazil, Australia, India, and the Lake Superior region. A magnet may show weak attraction if magnetite is present.
