Wolframite
Iron
manganese tungstate
(Fe,Mn)WO4
Wolframite
is actually a series between two minerals; Huebnerite and Ferberite.
Huebnerite is the Manganese rich end member while ferberite is the
iron rich end member. Wolframite is the name of the series and the
name applied to indistinguishable specimens and specimens intermediate
between the two end members. Most specimens found in nature fall
within 20 - 80% range of the series and these are termed wolframites.
Only if they are more pure than 80% manganese are they called
huebnerite and conversely if they are 80% iron they are called
ferberite.
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