What are vanadates in mineralogy ?

Vanadates : definition

The vanadates subclass belongs to the large mineralogical class of phosphates - arsenates - vanadates ; it is built from tetrahedral anionic groups (VO4)3-, associated with one or more cations.

Vanadates are rare minerals, about thirty in number, of which the best known representative is vanadinite Pb5(VO4)3Cl.

Equivalent tetrahedral units (AsO4)3- and (PO4)3- are the basis of arsenates and phosphates. P5+, As5+ and V5+ are easily replaced in the anionic groups, there are transition terms between phosphates, arsenates and vanadates : pyromorphite Pb5(PO4)3Cl, mimetite Pb5(AsO4)3Cl and vanadinite Pb5(VO4)3Cl, for example , form between them extended but not complete series.
Vanadinite from Mibladen, Morocco
Vanadinite from Mibladen, Morocco
Vanadinite from Mibladen, Morocco

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