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The chemical formula of mineral Uranocircite is indicated by Ba(UO2)2(PO4)2 – 10 to 12H2O or Hydrated Barium Uranyl Phosphate. Uranocircite is actually a phosphate mineral. It is also considered as a very minor ore  o uranium and it is often used as mineral specimen and is usually found exhibiting nice and interesting microscope images under polarizing microscopes used in optical mineralogy. Uranocircite is a rare but popular mineral among collectors who seek uranium-bearing minerals. The square distinctive tabular crystals of Uranocircite are very interesting when viewed with the aid of petrographic polarizing light microscopes. Uranocircite crystals are actually similar to that of the other members of the autunite/torbernite group of minerals but they actually tend to be more flatter or not as tabular. Slightly heavier Uranocircite specimens has more yellow color and the fluorescent color of the mineral is more green. Fine specimens of mineral Uranocircite should be stored in a close container to avoid water loss. It should be noted also that Uranocircite is a radioactive mineral. Therefore, it should be stored away from other minerals that are easily affected by radioactivity. Human exposure should be also limited.

 

            Mineral Uranocircite is usually found in various colors shades of yellow to light yellow green that could appear more fascinating when viewed with the aid of petrographic polarizing light microscopes used in optical mineralogy. Mineral Uranocircite is most commonly found showing vitreous to pearly luster on the main pinacoid that can be found more clearly visible when viewed with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy. Most crystals of mineral Uranocircite can be transparent to translucent in appearance.

             Mineral Uranocircite is known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. The crystal habits of the mineral Uranocircite usually include platy square crystals that are usually bladed aggregates. Crystals of Uranocircite can actually form in parallel growths giving a deck of cards kind of rock. Uranocircite can be also found as crusts, micaceous, foliated and scaly aggregates. Sometimes in attractive rosettes that could appear more fascinating when viewed with the aid of petrographic polarizing light microscopes for mineralogists. Uranocircite is commonly found showing perfect cleavage in one direction that appears more clearly visible under petrographic polarizing light microscopes. It is also usually found showing uneven fracture when evaluated under polarizing microscope for mineralogists. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually 2.5. Uranocircite is most commonly found leaving a yellow tint streak when rubbed on a white porcelain streak plate. The specific gravity measure of the mineral Uranocircite is approximately 3.5+grams per cubic centimeters, which is above average for translucent minerals. Uranocircite is a radioactive mineral. It also shows fluorescent green color under long wave ultra violet light. Uranocircite is also showing cleavage sheets that are slightly bendable. The best field indicators of mineral Uranocircite usually include fluorescence, crystal habit, radioactivity, color, density and associations. Mineral Uranocircite has notably occurrence at several localities including Germany, England, France, Zaire, France, Portugal and some areas in USA. 



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Wednesday, September 30th, 2009 at 3:39 am
Category:
The Phosphates Mineral Class
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