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The chemical formula of mineral Vesuvianite is indicated by Ca10(Mg, Fe)2Al4(SiO4)5(Si2O7)2(OH)4 or Calcium Magnesium Iron Aluminum Silicate Hydroxide. This Vesuvianite is actually a Silicate mineral. Vesuvianite is most commonly used as mineral specimen and also as gemstones that can be more fascinating when evaluated under polarizing microscopes for mineralogists. Vesuvianite is also known as Idocrase. It is actually a fascinating mineral that was originally found on the volcano named Mt. Vesuvius, hence the name. The other name Idocrase is from the Greek words for mixed forms. This is actually an allusion to its crystals showing a mixture of other mineral forms. The crystals of mineral Vesuvianite is known to belong to the tetragonal symmetry class and this actually shows a square cross-section found perpendicular to the long axis. The tetragonal crystals are usually uncommon and mineral Vesuvianite fortunately produces some very nicely shaped crystals. It has been oddly found that some of its structure is actually similar to that of the garnet mineral, grossularite, which is an isometric mineral.  

 

            Mineral Vesuvianite is normally found green in appearance, but it can also be found brown, yellow, blue and/or purple. It can be found showing nice and interesting appearance when viewed with the aid of petrographic polarizing light microscopes for mineralogists. Mineral Vesuvianite is most commonly found showing vitreous or greasy to resinous luster when viewed in reflected light of polarizing microscopes for mineralogists. Most crystals of mineral Vesuvianite are found transparent to translucent in appearance. The crystal habits of the mineral as described in the field of optical mineralogy usually include prismatic crystals with an overall square cross-section. There are usually two sets of four sided prisms with one set being dominant. It can be also found with the aid of polarized microscope in optical mineralogy that the termination is usually a four sided pyramid that can be either steeply or gently sloped. It can be also clearly found under petrographic polarizing microscopes for mineralogists that the faces of the pyramid align with the faces of the prisms making an edge that is perpendicular to the length of the crystal. When more closely examined with the aid of the polarizing microscope, a pinacoid can actually truncate the pyramid or form the entire termination. Massive forms are also common and these are actually quite difficult to distinguish from massive garnet mineral specimens.

 

Vesuvianite is most commonly found showing poor cleavage that can be found in only one direction, usually lengthwise when viewed under polarized microscope. The fracture shown by Vesuvianite is usually found conchoidal to uneven when closely evaluated under polarizing microscopes for mineralogists. The hardness measure of the mineral Vesuvianite when it is evaluated using the Mohs scale method is usually 6.5. Vesuvianite mineral specimen is most commonly found leaving a white streak when sample is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is usually found ranging from 3.33 to 3.5 grams per cubic centimeters. Vesuvianite crystals are usually found striated lengthwise and are slightly pleochroic. Vesuvianite is most commonly found associated with other interesting minerals including garnets, wollastonite, calcite, serpentine and diopside. The best field indicators of mineral Vesuvianite usually include localities, color, crystal habit and cleavage. Mineral Vesuvianite usually forms as a result of contact metamorphism on impure limestones and it is usually found with other exotic and interesting minerals. A massive green gem variety of this mineral is called californite, which was named from where it was found. It is a somewhat rare mineral yet beautiful and fascinating and it can actually rival many other minerals for interest among mineral collectors. Mineral Vesuvianite notably occurs at several localities including Canada, Italy, Switzerland, Russia and some areas in USA including California and the New England region.



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Wednesday, September 30th, 2009 at 3:45 am
Category:
The Silicates Mineral Class
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