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Serrabrancaite, MnPO₄·H₂O, a new mineral from the Alto Serra Branca pegmatite, Pedra Lavrada, Paraiba, Brazil

¹ Institut für Geologische Wissenschaften, Mineralogie/Geochemie, Domstrasse 5, D-06108 Halle, Germany
² Universidade Federal do Paraiba, Centro Ciências e Tecnologia, Departemento de Mineração e Geologia, Cidade Universitaria, Bloco BS, Campus II, Campina Grande, Paraiba, Brazil
³ Institut für Mineralogie, Kristallographie und Materialwissenschaft, Scharnhorststrasse 20, D-04275 Leipzig, Germany
⁴ Universidade Federal do Pará, Centro de Geociências, Rua Augusto Correa 1, Campus do Guamá, CP 1611-66075-110, Belém, Pará, Brazil

Correspondence: ^* E-mail: witzke{at}geologie.uni-halle.de

Serrabrancaite is a new manganese phosphate from the Alto Serra Branca pegmatite near Pedra Lavrada, Paraiba, Brazil. The mineral occurs as dark brown to dark greenish black isometric crystals up to 0.3 mm size. The crystals have an adamantine luster and are translucent. Chemical analysis yields (in wt%) Mn₂O₃ = 46.85, P₂O₅ = 42.72, H₂O = 9.8, total = 99.37. The empirical formula is Mn_0.98P_1.00O_3.98·0.90 H₂O, simplified to MnPO₄·H₂O. Serrabrancaite is monoclinic, space group C2/c, with unit-cell parameters a = 6.914(2), b = 7.468(2), c = 7.364(2) Å, ß = 112.29(3)°, V = 351.8(1) ų. The measured density is 3.17(1) g/cm³, the calculated density for Z = 4 is 3.16 g/cm³. Serrabrancaite is isostructural with the sulfates of the kieserite group. The mineral is an alteration product from a phosphate pegmatite and is accompanied by vernadite and phosphosiderite.

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