mineral
Iron-stained chalcedony or jasper
Microcrystalline quartz (SiO₂), likely ferruginous jasper/chalcedony
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque to slightly translucent, mustard-yellow, brown, orange, and gray coloration with earthy to waxy luster. The irregular piece appears massive, with no obvious cleavage and conchoidal fracture likely.
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Physical properties
Hardness about 6.5–7 Mohs; opaque to slightly translucent, mustard-yellow, brown, orange, and gray coloration with earthy to waxy luster. The irregular piece appears massive, with no obvious cleavage and conchoidal fracture likely.
Formation & geological history
Forms when silica-rich fluids fill cavities or replace host rock, while iron oxides create the yellow-brown-red staining; the specimen is likely Cenozoic or older, but age cannot be determined from the image. Common in volcanic and sedimentary environments.
Uses & applications
Used as lapidary material for cabochons, carvings, beads, and small decorative specimens; industrial value is negligible.
Geological facts
Jasper and chalcedony are varieties of microcrystalline quartz distinguished mainly by opacity and texture; the boundary between iron-stained chalcedony and jasper can be visually gradual.
Field identification & locations
Identify by its glassy/waxy appearance, high hardness, lack of cleavage, and inability to scratch with a steel nail easily; common sources include volcanic terrains, gravel deposits, and silica-rich veins worldwide.
