mineral

Iron-rich breccia, possibly hematite/goethite-bearing

Hematite (Fe₂O₃) and goethite (FeO(OH)) in a silica-rich breccia matrix

AI-generated identification · may be incorrect

Dark gray to rusty brown, earthy to submetallic luster, irregular fracture, and visibly granular/porous texture; apparent hardness about 5–6, but weathered coatings may be softer. The specimen shows angular fragments cemented by iron-oxide-rich material, with possible quartz or chalcedony.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when iron-bearing fluids oxidized and cemented fractured host rock, commonly in hydrothermal or near-surface weathering environments. Exact geological age and locality cannot be determined from the image.

Uses & applications

Primarily a collector specimen; hematite/goethite are important iron ores, while associated silica may be used decoratively. Not suitable for reliable construction identification from an image alone.

Geological facts

Rust-red streak strongly supports hematite or goethite; metallic gray surfaces may indicate specular hematite. Magnetism, if present, could indicate magnetite or maghemite mixed with the iron oxides.

Field identification & locations

Test streak on unglazed porcelain: hematite is red-brown, goethite yellow-brown, and magnetite black; inspect with a loupe for quartz and test magnetism. Common in iron-formation, hydrothermal-vein, and weathering deposits worldwide.