What is Cadvanite?
Cadvanite is a newly approved cadmium vanadate from the Burro Mine in Colorado, recognised by brownish-yellow colour and an unusual vanadate structure.
Mineralogy and structure
The reference formula is Cd(VO3)2. Cadvanite belongs to the vanadates and crystallises in the monoclinic system. Mindat lists cadvanite as a valid IMA species. Its monoclinic pseudobrannerite-type structure is related to a known synthetic analogue, but the natural mineral should not be confused with the visually similar vanadium mineral cavansite.
Colour and appearance
Typical colours include brownish yellow, yellow-brown and orange-brown. For small or complex mineral species, crystal size, transparency, lustre and matrix association are often more diagnostic than colour alone.
Formation and localities
Cadvanite forms in or is associated with oxidised cadmium- and vanadium-bearing mineralisation. Important documented localities include Burro Mine, San Miguel County, Colorado, USA, the type locality. A precise mine or geological setting is preferable to a broad country label when it is known.
Collecting and care
Cadvanite is best treated as a labelled reference or collector specimen. Protect fragile crystals from impact and humidity changes. Arsenic-, cadmium-, lead-, thorium- and selenium-bearing minerals should not be cut, ground or used in jewellery; wash hands after handling and keep them away from food and children.
