Jahnsite-(MnMnMg), IMA 2017-118

Jahnsite-(MnMnMg) Mn2+Mn2+Mg2Fe3+ 2 (PO4)4(OH)2Æ8H2O Proberylo, Sapucaia, Galile ´ia, Minas Gerais, Brazil (1854'3''S, 4129'4''W). Jahnsite group Monoclinic: P2/a; structure determined a = 15.177(2), b = 7.176(1), c = 10.006(3) Å, b = 111.01(2) 9.28(100), 4.945(39), 4.627(20), 3.521(43), 2.988(52), 2.842(81), 1.958(27), 1.581(27) Type material is deposited in the mineralogical collections of the Laboratoire de Mine ´ralogie, University of Liege, Ba ^t. B18, Sart Tilman, B-4000 Lie `ge, Belgium, catalogue no. 21140.