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The chemical formula of mineral Uvite is indicated by Ca(Mg, Fe)3Al5MgSi6O18(BO3)3(OH)3 or Calcium Iron Magnesium Aluminum Borosilicate Hydroxide. Uvite is actually a Silicate mineral. Uvite is most commonly used as mineral specimen and it is usually one of the nice to collect mineral specimens. It also belongs to the tourmaline group of minerals. It was actually considered as a very rare member of the tourmaline group of minerals. But at present time, it is already becoming widely available in the mineral market. Despite having so many coloring ions like iron and magnesium, some Uvite specimens actually remains colorless. The typical specimen of mineral Uvite that is commonly out in the market is the interesting dark green to almost black in color that can be more splendidly exhibited when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Almost other properties of Uvite tend to fall under the norms of being a tourmaline except for the fact that Uvite tends to form stubby crystals rather than the long prismatic crystals like the ones formed by its close cousins. However, it is also interesting to note that these crystals are actually well-formed and they usually shows all the interesting features that make tourmaline crystals so much fun to collect.

 

            Uvite is also a skarn mineral as noted in the field of optical mineralogy. Skarn is a term in optical mineralogy that means a product of a chemically unusual magma body that has intruded into and recrystallized a dirty limestone. This dirty limestone is not composed of calcite like the clean limestone. Instead, it is mixed with silicates and/or phosphates and many others. Mineral Uvite is most commonly found green, white, colorless, black or light brown in color that could still be interesting when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Uvite is also usually found showing vitreous luster when viewed in reflected light of polarized microscopes for mineralogists. Most crystals of mineral Uvite are found transparent to translucent in appearance, some are actually dark black specimens that may look opaque.

 

            Uvite is known to crystallize in the trigonal system of crystal formation. The crystal habits of the mineral as described in the field of optical mineralogy usually include three sided stubby almost tabular crystals. The terminations can actually be either a simple to complex trigonal pyramid or a flat basal face that can be seen more clearly visible when sample is evaluated with the aid of petrographic polarizing light microscope used in optical mineralogy. it can be also clearly found that the prism faces are striated lengthwise when specimen is evaluated more closely under polarized microscopes for mineralogists. if cross sections of the mineral are examined, just like other tourmalines, it will appear showing a predominant triangular shape crystal with some hexagon formation. Doubly terminated crystals are said to be hemimorphic. In optical mineralogy, this means that the two ends of the crystal are not exactly alike and this can be seen more clearly exhibited when specimen sample is closely examined with the aid of petrographic polarizing microscope. The hardness measure of Uvite when it is evaluated using the Mohs scale method is usually 7.5. Uvite has absent cleavage but there is basal parting found visible when specimen sample is evaluated with the aid of polarizing microscope. The specific gravity measure of the mineral is usually 3.0+ grams per cubic centimeters, which is considered average. Uvite is also found showing uneven to conchoidal fracture when viewed closely with the aid of polarizing light microscopes for mineralogists. it is also usually found leaving a white streak when sample is rubbed on a white porcelain streak plate. Uvite is known to be strongly pleochroic and also piezoelectric. Uvite is also commonly found associated with apatite, quartz, sphene, and zircon. The best field indicators of mineral Uvite usually include triangular cross-section, crystal habit, locality, environment, hardness and color. Uvite notably occurs at several localities including Sri Lanka, some areas in USA and in other Skarn localities.

 



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Wednesday, September 30th, 2009 at 3:42 am
Category:
The Silicates Mineral Class
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