Holtstamite

Al_0.994Ca₃H₄Mn_1.006O₁₂Si_1.95

Halenius, U.Haussermann, U.Harryson, H.

European Journal of Mineralogy (2005) 17, 375-382

a=12.337Å   b=12.337Å   c=11.930Å

α=90°   β=90°   γ=90°