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Formula:[Na(H2O)2.5][Fe3+8(PO4)6(OH)7(H2O)4]
Hydrated phosphate
Specific gravity: 2.94
Hardness: 3
Streak: White
Colour: White, creamy or yellow
Environments
Pegmatites
Hydrothermal environments
At the Moculta Phosphate Quarry, Angaston, Barossa Valley, Mount Lofty Ranges, South Australia, Australia, meurigite-Na occurs in
small cavities in fluorapatite-rich rock associated with
leucophosphite (AJM 17.1.21).
At Tom's Quarry, Kapunda, Mount Lofty Ranges, South Australia, goethite geodes have been
found lined with meurigite-Na in association with leucophosphite,
cacoxenite, natrodufrénite,
minyulite, wavellite,
cyrilovite and variscite
(AJM 17.1.21).
Meurigite-Na from Tom's Quarry - Image
At the type locality, the Silver Coin Mine, Humboldt county, Nevada, USA, meurigite-Na is a late-stage, low-temperature,
secondary mineral in complex phosphate assemblages rich in Fe3+ and
Na, associated with variscite, crandallite,
perhamite and jarosite (Mindat).
The paragenetic sequence includes (in approximate order from early to late) quartz,
baryte, apatite-(CaF),
goethite, rockbridgeite,
cacoxenite, alunite,
wardite, turquoise/
chalcosiderite, leucophosphite,
lipscombite/zinclipscombite, kidwellite,
strengite/variscite,
crandallite/perhamite and
jarosite (AM 94.720-727).
Meurigite-Na from the Silver Coin Mine -
Image
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