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Trade Terminology

Zippeite is a hydrous potassium uranium sulfate mineral with formula: K4(UO2)6(SO4)3(OH)104(H2O). It forms yellow to reddish brown monoclinic-prismatic crystals with perfect cleavage. The typical form is as encrustations and pulverulent earthy masses. It forms as efflorescent encrustations in underground uranium mines. It has a Mohs hardness of 2 and a specific gravity of 3.66. It is strongly fluorescent yellow in UV radiation and is a radioactive mineral.

  • Historical usage
  • A mineral which caught the attention of a Bohemian metallurgist, Adolf Patera in the 1850s by its striking colour. This was during the period when the fame of the Jachymov silver mines was dying out. On top of the large, forgotten pit-heaps, powdery minerals began to appear, vividly coloured, originating from the decomposition of the pitchblende. These colourful layers, in which zippeite was in the majority, gave Patera the idea of utilizing the uranium minerals in the manufacture of paints. Mining began in 1859 not only for the products which resulted from uraninite's decomposition, but for uraninite itself. A variety of yellow paints were manufactured because among all the secondary minerals on the pit-heap there was a prevalence of the yellow powdery coatings.

    Zippeite is one of the so-called 'uranium ochres'. It occures in association with uranopilite, a monoclinic, complex water-soluble alkaline with other secondary uranium minerals in the weathered veins of uranium. It was named after the Prague minerologist, F. X. M. Zippe (1791-1863). Apart from Jachymov in Bohemia it occurs mainly near Wolsendorf in Bavaria (Germany) and also in Utah (USA). Zippeite is no longer used for the manufacture of paints. It is used as a uranium ore, as is pitchblende.

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