Mineral Guide · Mineral
Cabvinite is a rare hydrated thorium fluoride hydroxide and the first natural actinide halide described as a mineral species.
Cabvinite is a rare hydrated thorium fluoride hydroxide and the first natural actinide halide described as a mineral species.
The reference formula is Th2F7(OH)·3H2O. Cabvinite belongs to the halides and crystallises in the tetragonal system. Its tetragonal structure contains thorium, fluoride, hydroxyl and structural water. Thorium-bearing specimens are display material only and should be handled and stored according to local radiation-safety guidance.
Typical colours include yellow, brownish yellow and pale brown. For small or complex mineral species, crystal size, transparency, lustre and matrix association are often more diagnostic than colour alone.
Cabvinite forms in or is associated with highly evolved alkaline and hydrothermal mineral assemblages. Important documented localities include the Passo del Rombo locality in Italy and other rare-element environments. A precise mine or geological setting is preferable to a broad country label when it is known.
Cabvinite 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.
Reviewed by NotOnlyRocks Editorial Team
Last reviewed: 31 August 2026
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