AM_Bustamite_1 Formula: Mn2.89 Ca3.11 Si6 O18 Name: Bustamite Unit cell: 9.864 10.79 7.139 99.53 99.71 83.83 , V=736.12 Space group: I-1 (2)

Ohashi Y , Finger L W , American Mineralogist , 63 (1978) p.274-288, The role of octahedral cations in pyroxenoid crystal chemistry. I. Bustamite,, wollastonite, and the pectolite-schizolite-serandite series, sample BS, from Hijikuzu, Iwate, Japan