mineral
Iron-stained chalcedony (possible agate/jasper)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
AI-generated identification · may be incorrectOpaque to slightly translucent, waxy-to-dull luster, mottled orange-brown and dark gray-green; hardness about 6.5–7 Mohs, no prominent cleavage. The photo does not show enough detail to confirm banding or identify a specific variety.
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Physical properties
Opaque to slightly translucent, waxy-to-dull luster, mottled orange-brown and dark gray-green; hardness about 6.5–7 Mohs, no prominent cleavage. The photo does not show enough detail to confirm banding or identify a specific variety.
Formation & geological history
Silica-rich fluids deposited quartz in rock cavities or fractures; iron oxides produced the rusty colors. Such deposits can form across many geological ages.
Uses & applications
Often collected or polished for ornaments and lapidary work; chalcedony and jasper are also used for beads and small carvings.
Geological facts
Chalcedony is a fine-grained form of quartz, and its iron-rich colors can resemble jasper. The specimen’s exact identity cannot be established from appearance alone.
Field identification & locations
Look for hardness near 7, a smooth waxy surface, and conchoidal fracture; acid testing is unnecessary. Chalcedony occurs worldwide in volcanic rocks, veins, and sedimentary settings.
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