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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of the mineral Grossular is indicated by Ca3Al2(SiO4)3 or Calcium Aluminum Silicate. Grossular is actually a Silicate mineral. Grossular is also known as Grossularite. This mineral species was actually first discovered at the Akhtaragda River Mouth in Eastern Siberian Region, Russia. The name of this mineral species Grossular is derived from the Latin word grossularia, which means gooseberry. Mineral Grossular is known to crystallize in the isometric system. In optical mineralogy, this isometric system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. Most Grossular mineral crystals are found transparent to translucent in appearance. Just like any other garnet mineral, Grossular is most commonly found forming rounded crystals with 12 rhombic or 24 trapezoidal faces or a combination of these and some other forms resulting to a very splendid piece of crystal when cut as gem.

 

Grossular is also a member of the Garnets group of minerals. Mineral Grossular is commonly used abrasive. It is also used for gemstone purposes and it commonly exhibits nice and fascinating appearance under gemological microscopes. Grossular is also used as mineral specimen and it is often found showing nice and interesting microscope images under petrographic polarizing light microscopes. Grossular is actually a calcium aluminum garnet mineral. Mineral Grossular has many color possibilities and is most probably the most colorful of all garnet minerals. The orange variety of mineral Grossular is the most common. Many collectors usually prize the specimens of orange Grossular crusts. That is because of its nice and fascinating appearance when viewed under geological polarizing microscopes. The green Grossular is called tsavorite and this one is occasionally cut for gemstone purposes and this commonly exhibits wonderful brilliance when evaluated with the aid of gemological microscopes. The red variety of mineral Grossular is called hessonite. This one is also sometimes used as gems.

            Mineral Grossular is most commonly found colorless, yellow, orange, green, red, gray and sometimes black in appearance when viewed under polarizing light microscopes. Grossular commonly exhibits a vitreous luster when viewed in reflected light of petrographic polarizing microscopes. When the mineral is evaluated with the aid of polarizing microscopes for mineralogists, it can be found that it has an absent cleavage. Grossular is usually found having conchoidal fracture when viewed under geological polarizing microscope. The specific gravity measure of the mineral usually gives an approximate value of about 3.5+grams per cubic centimeters, which is considered above average for translucent minerals. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually ranging from 6.5 to 7. When the mineral section is rubbed on a white porcelain streak plate, it is commonly found leaving a white streak.

 

The crystal habit of Grossular is a very classic habit for all garnet minerals. Grossular can be found in its typical rhombic dodecahedron form that can be found clearly visible when the crystal is evaluated with the aid of geological polarizing light microscopes. It can be also found in 24-sided trapezohedron. The combinations of these forms are usually common and sometimes the rare faces of hexoctahedron, a 48-sided crystal habit that is rarely seen by itself can be also found combining with the other forms making a very attractive, complex and multifaceted crystals when viewed under polarized microscopes. Grossular can be also found in massive and granular forms. But the most common form shown by Grossular is crust that shows many rhombic faces when viewed with the aid of polarizing light microscopes.

 

Grossular mineral crystals are sometimes found singly refractive when viewed in plane light of petrographic polarizing microscope used in optical mineralogy. Grossular is an isotropic mineral as described in the field of optical mineralogy. In optical mineralogy, this means that it has no power to produce illumination and consequently remain dark when evaluated under several viewing angles between crossed nicols of petrographic polarizing light microscopes. More often, they are found exhibiting anomalous double refraction. The index of refraction of mineral Grossular is commonly found 1.75. Grossular is also found showing dispersion of about 0.028 when viewed with the aid of geological polarizing microscopes. Many faces show a sort of striation caused by multiple crystal forms and these are usually very visible when the mineral is evaluated with the aid of petrographic polarizing light microscopes. Grossular is not pleochroic as described in optical mineralogy field. There is no specific data found on the toxicity and health dangers for mineral Grossular. However, the specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them. Grossular is a non-radioactive mineral species.

 

            Mineral Grossular is commonly associated with other interesting minerals like micas, idocrase, chlorite, calcite, diopside and serpentine. The best field indicators of the mineral Grossular usually include color, hardness, crystal habit and environment. Grossular mineral commonly forms in contact or regional metamorphic environments. It is also believed that they are also formed from the metamorphism of impure siliceous limestones. Grossular can be also found in metasomatic deposits. Grossular mineral notably occurs at several types of localities including Italy, Asbestos in Canada, Sri Lanka, Mexico and Kenya.



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Tuesday, July 29th, 2008 at 7:29 am
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The Silicates Mineral Class
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