Meymacite
Meymacite is an IMA-recognized mineral species in the tungstate class, with the chemical formula WO₃·2H₂O.
Key properties: specific gravity 3.94–4.1; Resinous to vitreous luster.
IMA symbol Mym, IMA status: approved, named in 1874.
An alteration product in tungsten deposits.
Originally applied to a mineral from Meymac, France, an alteration product of scheelite, later found to be ferritungstite. The name was, however, reinstated by the IMA CNMMN for this mineral.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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