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Phosphates of the Chalotskoe Pegmatite Deposit,Transbaikal Region
Authors:Lykova  I S  Varlamov  D A  Chukanov  N V  Pautov  L A  Ksenofontov  D A
Institution:1.Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskii pr. 18-2, Moscow, 119992, Russia
;2.Geological Faculty, Moscow State University, Moscow, 119992, Russia
;3.Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
;4.Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
;
Abstract:

A number of rare phosphates have been found in specimens from the Chalotskoe pegmatite deposit, Transbaikal region, Russia: väyrynenite, MnBePO4](OH,F); parascholzite, CaZn2PO4]2 · 2H2O; messelite, Ca2(Fe2+,Mn)PO4]2 · 2H2O; eosphorite, MnAlPO4](OH)2 · H2O; moraesite, Be2PO4](OH)4H2O; and fluorapatite. Väyrynenite forms pink grains 2–3 mm in size, less frequent prismatic crystals up to 0.8 × 3.0 cm, and spheres up to 3 mm in diameter. Parascholzite occurs as pockets up to 0.6 × 1.0 cm composed from snow-white small grains. Messelite forms pale yellow honeycomb grains and poorly shaped crystals up to 1 mm. Eosphorite has been seen in the Chalotskoe pegmatites before, but it has not been studied in detail. It occurs as red-brown prismatic crystals up to 8 cm in length, occasionally forming openbook- like aggregates and pink to pale pink grains up to 5 mm in size. Moraesite forms snow-white fibrous aggregates up to 5 × 6 mm, together with white spheres and short prismatic crystals of fluorapatite up to 1 mm. Microcline, albite, quartz, muscovite, beryl, schorl, almandine-spessartine, columbite-(Fe), and bertrandite are associated minerals. Väyrynenite and parascholzite are found for the first time in Russia.

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