Meurigite

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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