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Encyclopedia Britannica



VANADINITE

This article appears in Volume V27, Page 878 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: VAN-VIR
VANADINITE , a
mineral
  consisting of lead chloro-vanadate, (PbCl)Pb4(VO4)3, crystallizing in the hexagonal
system
  and isomorphous with pyromorphite and mimetite (q.v.). The crystals are usually six-sided prisms terminated by the basal planes, but are sometimes modified by numerous pyramidal planes which exhibit parallel hemihedrism. Rounded crystals and groups also occur. The colour is usually light brown or yellow, but crystals from
Arizona
  are
bright
  red. Owing to isomorphous replacement of the vanadium by phosphorus and arsenic, the specific gravity varies from 6.6 to 72; a variety containing much arsenic is called endlichite. The hardness is 3. The
mineral
  is one of secondary formation in veins of lead ore. It was first found in
Mexico
 , and in 1801 was asserted to contain a new
element
 , which was called " erythronium "; this was later proved to be identical with the subsequently discovered
element
  vanadium. Other well-known localities are Wanlockhead in Dumfriesshire, Kappel (Eisen-Kappel), near Klagenfurt in Carinthia,
Arizona
  and New
Mexico
 . (L. J. S.)


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