Leucophosphite

phosphate

pegmatites

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).

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 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 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).

Back to Minerals