Tamaite

CaH₁₈KMn₁₂O₆₁Si₂₀

Hughes, J. M.Rakovan, J. F.Bracco, R.Gunter, M. E.

American Mineralogist (2003) 88, 1324-1330

a=16.8146Å   b=25.2036Å   c=13.3866Å

α=90°   β=90°   γ=90°