mineral
Tumbled pink chalcedony (likely rose quartz or pink agate)
Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image
AI-generated identification · may be incorrectHardness about 7 Mohs; translucent to opaque pink, with a waxy-to-glassy luster and no visible cleavage. The smooth rounded surface indicates tumbling and polishing; color may come from iron, manganese, or microscopic inclusions.
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Physical properties
Hardness about 7 Mohs; translucent to opaque pink, with a waxy-to-glassy luster and no visible cleavage. The smooth rounded surface indicates tumbling and polishing; color may come from iron, manganese, or microscopic inclusions.
Formation & geological history
Forms when silica-rich groundwater fills cavities and fractures, precipitating microscopic quartz fibers; related deposits range from Precambrian to younger volcanic-hosted formations. Rose quartz is typically massive quartz, while pink chalcedony/agate is cryptocrystalline.
Uses & applications
Used as a lapidary stone, cabochon, bead, ornament, and inexpensive jewelry material. Common tumbled pieces generally have modest collector value.
Geological facts
Pink chalcedony can resemble dyed quartz, common glass, or resin; natural material usually feels cool and is substantially harder than glass or plastic. Strong color zoning or translucency may indicate agate.
Field identification & locations
Commonly found in Brazil, Madagascar, India, Uruguay, Namibia, and the United States. Identify with a hardness test only on an inconspicuous area: quartz should scratch ordinary glass, while reputable testing is preferable for a polished piece.
