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Greek baros : weight : pressure.
phosphate of barium
Minerals; Inorganic; Column Two
Description of the substance
Uranocircite is a rare but popular mineral among collectors who seek uranium-bearing minerals. Its square tabular crystals are distinctive from the members of the autunite/torbernite group of minerals. Uranocircite's crystals are similar to other members of this group, but they tend to be flatter or not as tabular. Autunite can be difficult to distinguish from uranocircite by ordinary means. However, in the slightly heavier uranocircite, the color is usually more yellow and the fluorescent color is more green.
The structure of uranocircite is composed of phosphate tetrahedrons linked to uranium-oxygen groups that form distorted octahedrons. The phosphates and uranium groups lie in sheets that are weakly held together by water molecules. This structure produces the platy habit, the one perfect direction of cleavage, and the relative softness.
Uranocircite can lose water and convert to a different mineral called meta-uranocircite of the meta-autunite/meta-torbernite group of minerals. The change to meta-uranocircite will often produce a pseudomorph. A pseudomorph is generally an atom by atom replacement of one mineral's chemistry to form another mineral. The process leaves the crystal shape of the lost mineral intact. Pseudomorph means false (psuedo) shape (morph). In this case, the conversion is not so dramatic since it involves only the loss of a few water molecules, and therefore a good pseudomorph is likely to form. The conversion is irreversible and ongoing, and all collection specimens of a certain age are almost certainly at least partially converted.
Fine specimens should be stored in a closed container to avoid water loss. Remember, this is a radioactive mineral and should be stored away from other minerals that are affected by radioactivity and human exposure should be limited.