mineral
Yellow chalcedony (likely citrine-like quartz)
Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine
AI-generated identification · may be incorrectTranslucent 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.
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Physical properties
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.
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.
