AM_Bustamite_2 Formula: Ca4.88 Mn1.12 Si6 O18 Name: Bustamite Unit cell: 9.994 10.946 7.231 99.3 100.56 83.29 , V=764.30 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 Ca-BS, from Hijikuzu, Iwate, Japan