Citation: Lussier, A.; Ball, N.A.; Hawthorne, F.C.; Henry, D.J.; Shimizu, R.; Ogasawara, Y.; Ota, T. (2016). Maruyamaite, K(MgAl2)(Al5Mg)Si6O18(BO3)3O, a potassium-dominant tourmaline from the ultrahigh-pressure Kokchetav massif, northern Kazakhstan: Description and crystal structure. American Mineralogist, 101, pp. 355-361.
Formula: Al7 B3 K Mg2 O28 Si6
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al45 B9 Fe18 Mg27 O93 Si18 Ti9 (Al15 B3 Fe6 Mg9 O31 Si6 Ti3)
Multiplicity: 1