mineral
Tumbled amber-colored chalcedony and quartz
Chalcedony (microcrystalline SiO₂), quartz (SiO₂), possibly carnelian or citrine; one piece may be druzy chalcedony
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; translucent yellow, orange, honey, and gray colors; waxy to vitreous luster; cryptocrystalline chalcedony or crystalline quartz, with no obvious cleavage and conchoidal fracture. Rounded surfaces indicate tumbling and polishing.
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Physical properties
Hardness 6.5–7 Mohs; translucent yellow, orange, honey, and gray colors; waxy to vitreous luster; cryptocrystalline chalcedony or crystalline quartz, with no obvious cleavage and conchoidal fracture. Rounded surfaces indicate tumbling and polishing.
Formation & geological history
Silica-rich fluids deposited chalcedony in cavities and fractures, while quartz crystallized in veins or geodes; coloration commonly comes from iron oxides. Specimen ages vary widely by locality, generally Paleozoic to Cenozoic.
Uses & applications
Used as lapidary material for cabochons, beads, carvings, and decorative stones; common tumbled specimens are primarily collectible or ornamental.
Geological facts
Orange-red chalcedony is called carnelian; yellow varieties may be marketed as yellow chalcedony, citrine, or honey quartz. Some commercial stones may be heat-treated or dyed.
Field identification & locations
Identify by hardness, translucent waxy appearance, conchoidal fracture, and inability to scratch with a steel blade; quartz should scratch glass. Exact species and locality require testing or seller information.
