Monoclinic Sb-rich gustavite: crystal structure

Reference:
• Pazout, R. & Dusek, M. (2009): Natural monoclinic AgPb(Bi2Sb)3S6, an Sb-rich gustavite. Acta Crystallografica, C65, i77-i80.

Synopsis:
The crystal structure of the Sb-rich variety of the mineral gustavite, AgPb(Bi2Sb)3S6, a naturally occuring monoclinic lillianite homologue with N = 4, has been solved and refined for the first time by means of single-crystal X-ray diffraction. The crystal structure consists of blocks of diagonal chains of four octahedra, viz. M1a (Bi), M2a (Sb/Bi), M2b (Bi/Sb) and M1b (Ag), separated by Pb atoms in a trigonal prismatic coordination.

Added.

Crystal data:
Space group P21/c
_cell_length_a 7.0455(6)
_cell_length_b 19.5294(17)
_cell_length_c 8.3412(11)
_cell_angle_beta 107.446(10)
_cell_volume 1094.9(2)



Edited 1 time(s). Last edit at 11/02/2009 06:57PM by Uwe Kolitsch.