Citation: Nagashima, M.; Sano, Y.; Kochi, T.; Akasaka, M.; Sano-Furukawa, A. (2020). Crystal chemistry of Sr-rich piemontite from manganese ore deposit of the Tone mine, Nishisonogi Peninsula, Nagasaki, southwest Japan. Journal of Mineralogical and Petrological Sciences, 115, pp. 391-406.
Formula: Al1.99 Ca1.73 Fe0.37 H Mg0.01 Mn0.68 O13 Si2.99 Sr0.22