Leucophosphite

leucophosphite

ferrostrunzite

tinsleyite

variscite

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Formula:KFe3+2(PO4)2(OH).2H2O
Hydrated phosphate containing hydroxyl. It forms a series with tinsleyite (AJM 71.1.19).
Specific gravity: 2.948
Hardness: 3½
Streak: White
Colour: White to greenish, buff, yellow-brown, orange-brown, pink, greenish brown, brownish purple
Solubility: Soluble in 1:1 hydrochloric and sulphuric acid (Dana)
Environments

Pegmatites
Biogenic sedimentary environments

Leucophosphite is formed by the action of solutions derived from bird or bat guano upon serpentine or earlier iron-bearing minerals; it is also formed from the hydrothermal alteration of earlier iron-bearing phosphates in granite pegmatites (Mindat, Webmin, HOM). Associated minerals include chalcedony, opal, serpentine minerals and variscite (Mindat).

Localities

At Northparkes, Kennedy county, New South Wales, Australia, leucophosphite is associated with goethite, atacamite and baryte (AJM 10.2.55).

At Broken Hill, Yancowinna county, New South Wales, Australia, leucophosphite is found scattered across chalcosiderite - turquoise (AJM 3.1.47).

At the Moculta Phosphate quarry, Angaston, Mount Lofty Ranges, South Australia, leucophosphite is associated with variscite, wavellite, minyulite and natrodufrénite (AJM 17.1.19).

At Tom's quarry, Kapunda, Mount Lofty Ranges, South Australia, leucophosphite is associated with natrojarosite, wavellite, meurigite-Na, natrodufrénite, cacoxenite and morinite (AJM 17.1.19).

At the Fairview Quarry, Robertstown, Mount Lofty Ranges, South Australia, leucophosphite is associated with turquoise, cyrilovite and fluellite (AJM 17.1.19).

At the Mount Deverell variscite deposit, Milgun Station, Western Australia, leucophosphite generally occurs at the margins of veins containing segelerite, montgomeryite, gordonite, collinsite, mitridatite and/or hydroxylapatite. In some cases it completely replaces veins of variscite. In one specimen it was associated with mitridatite and cyrilovite. The variscite deposits are hosted by marine sedimentary rocks (AJM 20.2.26).

At the type locality, the Ninghanboun Hills, Weelhamby Lake, Western Australia, leucophosphite was found in veinlets in serpentine, due to the actions of solutions of bird guano on the serpentine, associated with variscite, chalcedony and opal (Dana, AM 42.214-221).

At the Sapucaia pegmatite, Minas Gerais, Brazil, Leucophosphite occurs sparingly in close association with cyrilovite and phosphosiderite lining vugs in frondelite. phosphosiderite, cyrilovite, and leucophosphite are secondary minerals after frondelite (AM 42.214-221). The leucophosphite from the Sapucaia pegmatite mine represents the first known occurrence of leucophosphite in a pegmatite (AM42.214-221).

At Bomi hill and Bamputa, western Liberia, leucophosphite is formed as a result of solutions from bat dung (Dana) associated with strengite and phosphosiderite (HOM, AM 42.214-221).

At Bethel Church, Pike county, Indiana, USA, leucophosphite is associated with vivianite, aluminian strengite, diadochite, ferrostrunzite and fluorapatite (HOM).

At the Emmons pegmatite, Greenwood, Oxford county, Maine, USA, leucophosphite is rare, but where it occurs it is usually associated with phosphosiderite. The Emmons pegmatite is an example of a highly evolved boron-lithium-cesium-tantalum enriched pegmatite (R&M 94.6.510).

At the Tip Top mine, Custer county, South Dakota, USA, leucophosphite is among the latest minerals to form in open pockets in rockbridgeite, which derives from the hydrothermal reworking of triphylite (AM 57.397-410), associated with rockbridgeite and triphylite (HOM).

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