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Wolframite [(Fe,Mn)WO4]

Structure Monoclinic
Space Group : P 2/c (No. 13)
a=4.753 Å, b=5.720 Å, c=4.968 Å
a=90.00, b=90.08, g=90.00
Z=2

Atomic Positional Parameters
W  2a 0.0000 0.1808 0.2500
Fe 2f 0.5000 0.3215 0.7500
O  4g 0.2167 0.1017 0.5833
O  4g 0.2583 0.3900 0.0900

(Fe0.85Mn0.05Mg0.1)WO4

Reference
Escobar C, Cid-Dresdner H, Kittl P and Duemler I (1971) American Mineralogist 56 489

Mineral Chemistry
Wolframite is the principal ore of tungsten, and is found in quartz veins associated with granites, occurring with scheelite. Phases structurally related to wolframite are the two end members of the wolframite solid solution, huebnerite (MnWO4), and ferberite (FeWO4).

The CHIME figure shows iron (manganese) as ochre spheres, oxygens as red spheres, and tungstens as crimson spheres. The unit cell is outlined.