Citation: Vereshchagin, O. S.; Rozhdestvenskaya, I. V.; Frank-Kamenetskaya O V; Zolotarev, A. A. (2014). Ion substitutions and structural adjustment in Cr-bearing tourmalines Note: Sample 4. European Journal of Mineralogy, 26, pp. 309-321.
Formula: Al6.15 B3 Ca0.41 Cr0.18 H3.56 Mg2.79 Na0.43 O31 Si5.88
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al45 B9 Cr27 Mg27 O105 Si18 (Al15 B3 Cr9 Mg9 O35 Si6)
Multiplicity: 1