mineral
Tumbled yellow chalcedony (likely citrine or yellow jasper)
Cryptocrystalline quartz, SiO₂; exact identification requires testing
AI-generated identification · may be incorrectMohs hardness 6.5–7, translucent yellow-orange body, waxy to vitreous luster, no visible cleavage, and conchoidal fracture; the smooth shape indicates tumbling or natural abrasion.
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Physical properties
Mohs hardness 6.5–7, translucent yellow-orange body, waxy to vitreous luster, no visible cleavage, and conchoidal fracture; the smooth shape indicates tumbling or natural abrasion.
Formation & geological history
Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; yellow color may result from iron impurities or heating. Formation ages vary widely, often from the Cenozoic to older volcanic sequences.
Uses & applications
Used as a lapidary stone, cabochon, bead, carving, and decorative specimen; generally inexpensive unless color and translucency are exceptional.
Geological facts
Yellow chalcedony can resemble citrine, yellow jasper, dyed agate, or resin. A glassy, translucent interior favors chalcedony/citrine, while opaque mottling favors jasper.
Field identification & locations
Common in Brazil, Uruguay, India, Madagascar, Mexico, and the western United States. Scratch testing should be avoided on valuable pieces; a streak, loupe, and specific-gravity test help distinguish quartz from softer imitations.
