Hydrated acid phosphate
Specific gravity: 3.15 to 3.20
Streak: Nearly white
Colour: Commonly pink to colourless, also red, orange, orange-red, reddish brown, yellowish brown, violet-rose, amber, grey
Solubility: Readily soluble in acids
Hureaulite is a late-stage secondary mineral formed by alteration
of primary phosphates in complex
granite pegmatites, associated with
triplite (HOM, Mindat).
Hureaulite is one of the more persistent low temperature transition metal phosphate hydrates derived from hydrothermal attack of triphylite-lithiophilite crystals in granite pegmatites. Hureaulite characteristically occurs very late in the secondary phosphate paragenetic sequence (AM 58.302-307).
At the type locality, Les Hureaux, Saint-Sylvestre, Haute-Vienne, Nouvelle-Aquitaine, France, hureaulite occurs in a zone of altered triphylite in a granite pegmatite, associated with rockbridgeite, cacoxenite, and vivianite in cavities in heterosite (Dana, Mindat).
At the Stewart pegmatite, Pala, San Diego county, California, USA, hureaulite occurs with sicklerite, phosphosiderite and stewartite in altered lithiophilite (Dana, AM 70.395-408).
At Branchville, Ridgefield, Fairfield county, and the Strickland Quarry, Portland, Middlesex county, Connecticut, USA, hureaulite is a secondary mineral found with fairfieldite, dickinsonite, reddingite, and eosphorite as hydrothermal alteration of lithiophilite (Dana).
At the Emmons pegmatite, Greenwood, Oxford county, Maine, USA, hureaulite is a common replacement of rhodochrosite that is associated with lithiophilite. Stewartite and phosphoferrite are common associated minerals. The Emmons pegmatite is an example of a highly evolved boron-lithium-cesium-tantalum enriched pegmatite (R&M 94.6.508-509).
At the Palermo number 1 and Fletcher mines, Groton, Grafton county, New Hampshire, USA, hureaulite occurs in weathered triphylite with phosphosiderite, strengite and heterosite (Dana).
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