mineral

Yellow chalcedony (likely citrine-like quartz)

Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine

AI-generated identification · may be incorrect

Translucent yellow to honey color with vitreous-to-waxy luster and conchoidal fracture; quartz hardness is 7 Mohs, with no cleavage and specific gravity about 2.6. The granular, uneven appearance favors chalcedony over a well-formed citrine crystal.

Identified September 14, 2026More mineral →

Explore Yellow chalcedony (likely citrine-like quartz) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures, with iron impurities producing yellow coloration; generally formed in volcanic or sedimentary environments over geologically recent to ancient times. Exact age cannot be determined visually.

Uses & applications

Used as a lapidary material for cabochons, beads, carvings, and small decorative specimens; attractive transparent pieces may be sold as low-grade gemstone material.

Geological facts

Yellow chalcedony is commonly confused with citrine, yellow jasper, resin, or glass. A scratch test against ordinary steel is not diagnostic; quartz should scratch glass, though testing may damage the specimen.

Field identification & locations

Common sources include Brazil, Uruguay, Madagascar, India, and the western United States. Look for natural conchoidal fracture, uneven translucency, and hardness; bubbles or perfectly uniform color suggest glass or resin.