Kolovratite, originally described in 1922 as a new nickel vanadate, has been regarded as doubtful because of the lack of description and its uncertain composition. It occurs as incrustations in schists and slates of the Fergana region, USSR. Recently obtained x-ray powder data and an x-ray fluorescence study of type- locality material indicate that kolovratite is a hydrous zinc-nickel vanadate, or perhaps silico-vanadate, rather than a nickel vanadate. A comparison of powder data with that for vesignieite, a hydrous copper barium vanadate, is given.

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