Isolated by J. J. and F. Elhuijar at Vergara, Spain.
Remarks
Obtained as dull gray powder, difficult to melt. Metal is lustrous and silvery white. Resists attack by oxygen, acids, and alkalis. Used in alloys, light bulb filaments, and cutting tools.
Diagnostic tests: Wolframates (Tungstates )(WO42-): When the
mineral is decomposed by boiling in HCL, the insoluble WO3
canary yellow oxide is obtained.
Tungsten gives a Na2(NH4)(PO4) bead
a
clear (no) color in the oxidizing flame and a fine blue color in the
reducing flame.
References
Emsley, J., 1991; THE ELEMENTS : Sec. Ed.,
Clarendon Press, Oxford, 251 p.
(* - Mineral Name Is Not IMA Approved)
(! - New Dana classification added or changed from Danas New Mineralogy)
(? - IMA Discredited Mineral Species Name)
There are 49 minerals with W in the Mineralogy Database.