Stukenberg Geology Museum of Kazan State University
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Chromates, Molybdates and Tungstates

Minerals of these classes are natural salts of chromic, molybdenian and tungsten acids correspondently. They are rare and not numerous. The number of minerals of these three classes approximately comes to 30. Some molybdates and tungstates accumulates independently being the most important ores of molybdenum and tungsten.

As for chromates of the KSU Geology Museum Mineralogy Section crocoite samples from Berezovskoye Deposit in the Urals are worth seeing first of all. Crocoite from the deposit has been recognized as a "standard" in different mineralogy museums of the world. It is characterized by perfect condition of crystals, their big size, bright diamond shining and orange-red color in the lumps of the Kazan Museum.

Samples of wulfenite - Pb(MoO4) and scheelite - Ca(WO4) from many deposits of the world are exhibited in the Mineralogy Section among the most widely spread molibdates and tungstates. If one directs ultra-violet rays to a scheelite sample, the mineral shines brightly in light-blue. This phenomenon is called luminescence, which is the most obvious in scheelite.

Crocoite. Beryozovskoye Deposit, the Urals
Beryozovskoye Deposit,
the Urals

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