Jahnsite-(MnMnMg), IMA 2017-118

Mn2+Mn2+Mg2Fe3+ 2 (PO4)4(OH)2Æ8H2O Proberylo, Sapucaia, Galile´ia, Minas Gerais, Brazil (1854'3''S, 4129'4''W) Pietro Vignola*, Fre´de´ric Hatert, Maxime Baijot, Nicola Rotiroti, Andrea Risplendente and Sergio Vavello 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