mineral

Tumbled yellow chalcedony (likely citrine or yellow jasper)

Cryptocrystalline quartz, SiO₂; exact identification requires testing

AI-generated identification · may be incorrect

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.

Identified August 23, 2026More mineral →

Explore Tumbled yellow chalcedony (likely citrine or yellow jasper) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

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.