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Formula:Al2(PO4)F2(OH).7H2O
Hydrated phosphate containing halogen
Crystal System: Orthorhombic
Specific gravity: 2.139 to 2.17 measured, 2.29 calculated
Hardness: 3
Streak: White
Colour: Colourless, white, yellow
Environments
Fluellite is a rare secondary mineral, formed by weathering of earlier
phosphates in some complex granite pegmatites. Associated minerals include
fluorapatite, wavellite,
phosphosiderite, strengite,
aldermanite, cacoxenite,
variscite, turquoise,
fluorite and quartz
(HOM).
Localities
In the phosphate deposits of South Australia, fluellite is abundant. At St John's quarry it occurs as isolated crystals
associated with
wavellite and minyulite. At Moculta and Tom's quarry
it can be partially or totally replaced by aldermanite,
crandallite or perhamite
(AJM 17.1.16).
At the Königswart mine, Schönegründ, Baiersbronn, Freudenstadt, Karlsruhe, Baden-Württemberg, Germany, fluellite occurs as an
alteration product of triplite
(Dana).
At Hagendorf, Waidhaus, Neustadt an der Waldnaab, Upper Palatinate, Bavaria, Germany fluellite occurs with
phosphosiderite and strengite
(Dana).
At the type locality, the Stenna Gwyn mine, Foxhole, St Stephen-in-Brannel, Cornwall, England, UK, fluellite occurs as minute crystals
on quartz associated with fluorite,
arsenopyrite, torbernite and
wavellite
(Dana, Mindat)>
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