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Formula: BaNa4CaFe13Al(PO4)11(PO3OH)F2
Phosphate, barium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.61 measured, 3.650 calculated
Hardness: 4½ to 5
Streak: Very pale yellow
Colour: Yellowish brown to greenish yellow
Environments
Pegmatites
Hydrothermal environments
Localities
At the Pegmatite No. 31, Nanping pegmatite field, Yanping District, Nanping, Fujian, China, one type of
triphylite successively transformed to
lazulite, wagnerite,
fluorarrojadite-(BaNa) and fluorapatite, suggesting successive
replacement processes during magnesium-rich, sodium-rich and calcium-rich hydrothermal stages
(EJM 26.1.179–188).
At the type locality, the Elisabeth mine, Gemerská Poloma, Rožňava District, Košice Region, Slovakia,
fluorarrojadite-(BaNa) was found on the dump of Elisabeth adit. It occurs in hydrothermal
quartz veins intersecting highly fractionated,
topaz–zinnwaldite
leucogranite. Fluorarrojadite-(BaNa) is associated with
fluorapatite,
‘fluordickinsonite-(BaNa)’,
triplite, viitaniemiite and
minor amounts of other minerals. It forms fine-grained irregular aggregates up to 4 cm x 2 cm, which consist of
individual anhedral grains up to 0.01 mm in size
(MM 82.863-876).
Fluorarrojadite-(BaNa) from the Elisabeth Mine -
Image
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