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The chemical composition of the mineral Edenite is indicated by the formula NaCa2(Mg, Fe)5AlSi7O22(OH)2 or Sodium Calcium Magnesium Iron Aluminum Silicate Hydroxide. Edenite actually is Silicate mineral. Mineral Edenite was first discovered in 1839, while Ferro-Edenite was during 1940s. The first Edenite mineral specimen was actually discovered from the rocks of Franklin Marble. This rock actually extends from the famous mines of Franklin New Jersey into New York. The mineral species Edenite derived its name from its type of locality Edenville, New York. Edenite mineral is known to crystallize in the monoclinic system. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of them are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis.

 

Edenite is most commonly used as mineral specimen and it is usually found exhibiting splendid microscope images when evaluated under polarized light microscopes used in optical mineralogy. Mineral Edenite is also considered as an uncommon amphibole mineral well described in optical mineralogy. Edenite is also related to the more well-known amphibole mineral called hornblende. Hornblende is no longer considered as an official mineral but still it is used as a general term for aluminum, iron, calcium and magnesium rich amphibole minerals for which Edenite is one of them. Before mineral Edenite adopted its official name and regarded as a distinct mineral, it was once called Edenite hornblende.

 

Most Edenite mineral crystals are found translucent to opaque in appearance. The crystal habit of the mineral commonly includes the stubby crystal that are found having nearly diamond-shaped crossed sections at points of which can be truncation can be made by minor faces of a prism. Terminations can be also found visible when viewed under geological polarizing microscopes. These are actually typical terminations, which appear to be two faces of a slightly slanted dome, which are actually two of the four face of the prism. The faces of terminations are also slanted with respect to the long axis of the crystal and not only toward each other. The complex termination of the mineral Edenite crystals can actually make the mineral appear pseudo-orthorhombic when evaluated under geological polarizing light microscopes. Edenite crystals are commonly twinned as described in optical mineralogy field. And they usually results in the groove or notch running down the spine of the prismatic crystal that are commonly clearly visible when evaluated with the aid of petrographic polarizing light microscopes. Sometimes when the mineral is closely viewed with the aid of polarizing microscopes, a fibrous crystal habit can be also found.

 

            Mineral Edenite is most commonly found exhibiting a nice and fascinating microscope images when viewed under petrographic polarizing light microscope. The colors that are most often displayed by Edenite is in shades of green to black as well as dull gray or brown that are commonly splendidly exhibited under polarized microscope used in optical mineralogy. The translucent green specimen of mineral Edenite is the best example of this mineral. Edenite is commonly found showing a pearly to dull luster when viewed in reflected light of the petrographic polarizing light microscope. Edenite is most commonly exhibiting imperfect cleavage in two directions at nearly 60 to 120-degrees when viewed closely with the micrometer eyepiece of the petrographic polarizing light microscope. Mineral Edenite also exhibits uneven fracture and is usually clearly exhibited under polarizing microscopes for mineralogists. The specific gravity measure of the mineral usually gives an approximate value of 3.06 grams per cubic centimeters, which is slightly above average for non-metallic minerals. The hardness measure of the mineral Edenite when evaluated using the Mohs scale method is usually found ranging from 5 to 6. When mineral Edenite is rubbed on a white porcelain streak plate, it is commonly found leaving white streak.

 

            Mineral Edenite is commonly found having a biaxial positive figure when evaluated between crossed nicols of polarized light microscopes in optical mineralogy. Index of refraction is commonly found ranging from 1.606 to 1.672 as described in optical mineralogy field. Mineral Edenite shows weak to distinct dispersion when viewed in plane light of polarizing microscope for mineralogists. The maximum birefringence found displayed by the mineral in plane light of polarizing microscopes is commonly 0.0250. Edenite exhibits a moderate surface relief when evaluated under several adjustments on the aperture diaphragm of petrographic polarizing light microscopes. Edenite is pleochroic mineral and this can be noticed more clearly when it is viewed with the aid of the petrographic polarizing microscopes. Shown splendidly  under polarized microscope are colorless crystals and some shades of blue, green, brown, gray and violet. Mineral Edenite is a non-radioactive mineral. There is no specific data found on the toxicity and health dangers for mineral Edenite. However, the specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them.

 

            Edenite is commonly associated with several other interesting minerals such as tremolite, biotite, calcite, spinel, kaolinite and pyroxenes. The best field indicators of mineral Edenite commonly include crystal habit, most especially the cross section, cleavage, locality, color and luster. Mineral Edenite is commonly formed at sodium and aluminum rich granitic pegmatites and metamorphic skarns. Although not very common, mineral Edenite can be actually found around the world. Mineral Edenite notably occurs at some famous mineral localities including Franklin New Jersey in the United States, England and Aldan Shield in Siberia, Russia, Mont Saint-Hilaire in Quebec, Canada, Cygnet, Tasmania in Austria and Edenville, Orange County in New York, USA.



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Tuesday, July 29th, 2008 at 7:28 am
Category:
The Silicates Mineral Class
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