Pyrophanite-ecandrewsite
Mitchell R H, Liferovich R P
The Canadian Mineralogist 42 (2004) 1871-1880
The pyrophanite-ecandrewsite solid-solution: crystal structures
of the Mn1-xZnxSiO3 series (0.1 <= x <= 0.8)
Sample: x = .5, ilmenite structure
_database_code_amcsd 0005998
5.10630 5.10630 14.0992 90 90 120 R-3
atom      x      y      z  occ Biso
Mn        0      0 .36093   .5   .7
Zn        0      0 .36093   .5   .7
Ti        0      0 .14779        .2
O     .3204  .0297  .2442        .2