Citation: Brugger, J.; Armbruster, T.; Meisser, N.; Hejny, C.; Grobety, B. (2001). Description and structure of turtmannite, a new mineral with a 68 A period related to mcgovernite. American Mineralogist, 86, pp. 1494-1505.
Formula: As1.12 Mg4.44 Mn19.5 O45.6 Si2.76 V2.38
Chemical name:(Mn19.50 Mg4.44) (V2.38 As1.12 Si2.76) O27.3 (O H)21.3