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Formulae:
Meurigite-K: KFe3+8(PO4)6(OH)7.6.5H2O
Meurigite-Na: [Na(H2O)2.5][Fe3+8(PO4)6(OH)7(H2O)4]
Hydrated phosphates containing hydroxyl
Specific gravity: Meurigite-K: 2.96, Meurigite-Na: 2.94
Hardness: 3 both
Streak: Meurigite-K: Pale yellowish white, Meurigite-Na: White
Colour: Meurigite-K: Yellowish brown, cream to white, pale to canary yellow, Meurigite-Na: white, creamy, or yellow
Environments
Pegmatites
Hydrothermal environments
Meurigite-K
Meurigite-K is a late-stage mineral, rare at all localities (HOM).
At the Wycheproof granite quarry, Buloke Shire, Victoria, Australia, meurigite-K
is associated with rockbridgeite, cyrilovite
and leucophosphite (HOM).
At Hagendorf, Germany, meurigite-K is formed by alteration of triphylite in a
granite pegmatite, associated with nontronite,
rockbridgeite, apatite,
vivianite, strengite,
beraunite, robertsite -
mitridatite, cyrilovite,
laueite and stewartite (HOM).
At the Gold Quarry mine, Nevada, USA, meurigite-K occurs in the oxidized zone of a low-temperature sediment-hosted hydrothermal
gold deposit, associated with fluellite,
kingite, tinticite,
leucophosphite, strengite/
variscite, hewettite,
tyuyamunite and torbernite (HOM).
At the type locality, the Chino Mine, Grant county, New Mexico, USA, meurigite-K occurs in the oxide zone of a
copper deposit, associated with beraunite,
dufrénite, hematite and
leucophosphite (Mindat, R&M 84.6.499).
At the Santa Rita mine, New Mexico, USA, meurigite-K occurs along a fault gouge in the oxidised zone of a copper sulfide deposit,
associated with dufrénite, beraunite,
leucophosphite and hematite (HOM).
Meurigite-Na
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).
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).
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