mineral
Tumbled quartz-rich chalcedony (likely carnelian or orange jasper)
Microcrystalline quartz, SiO₂, colored mainly by iron oxides
AI-generated identification · may be incorrectOrange-brown, opaque to slightly translucent, with a dull-to-waxy luster and fine sugary texture; quartz hardness is about 7 Mohs, with no visible cleavage and conchoidal fracture. The rounded shape indicates tumbling or natural abrasion.
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Physical properties
Orange-brown, opaque to slightly translucent, with a dull-to-waxy luster and fine sugary texture; quartz hardness is about 7 Mohs, with no visible cleavage and conchoidal fracture. The rounded shape indicates tumbling or natural abrasion.
Formation & geological history
Silica-rich fluids deposited chalcedony in cavities or fractures, while iron oxidation produced the orange-red coloration; the exact geological age cannot be determined visually. If strongly translucent and evenly red-orange it is carnelian; if opaque and mottled it is more likely orange jasper.
Uses & applications
Used as a lapidary stone for cabochons, beads, carvings, and polished specimens; common pieces have modest decorative and collecting value.
Geological facts
Carnelian is a chalcedony variety, whereas jasper is opaque, impurity-rich quartz. Heating can intensify iron-based red-orange colors.
Field identification & locations
Common in volcanic cavities, sedimentary silica deposits, and alluvial gravels worldwide, including India, Brazil, Uruguay, Madagascar, and the United States. Confirm with a glass-scratch test only if damage is acceptable: quartz should scratch glass.
