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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Legrandite is indicated by Zn2AsO4(OH) – H2O or Hydrated Zinc Arsenate Hydroxide. Legrandite is actually a Phosphate mineral. The first specimen of mineral Legrandite was discovered at Flor de Pena Mine in Mexico. The mineral was first described in 1932. Legrandite is a rare arsenate mineral that was named after Legrande, a Belgian mining engineer. This mineral Legrandite is very well known around the world. And it is from the famous localities around Mapini, Mexico. Legrandite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which 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.

 

Legrandite is most commonly used as mineral specimen and it is often found exhibiting nice and wonderful appearance when viewed under petrographic polarizing light microscopes used in optical mineralogy. Legrandite is actually a favorite of many collectors. This mineral, although rare, is very beautiful most especially when it is evaluated with the aid of the petrographic polarizing light microscope. Mineral Legrandite usually exhibits a nice luster in reflected light of polarizing microscopes. It has actually a vitreous luster that seems to radiate its usually rich yellow color that is often found majestically exhibited under polarized light microscope.

 

            Legrandite is most commonly found exhibiting straw to orange yellow to colorless appearance and is often found exhibiting interesting microscope images under polarizing microscope for geologists. Legrandite is most commonly found displayins vitreous luster when viewed in reflected light of polarized microscope for mineralogists. Legrandite is also most commonly found displaying poor cleavage in one direction that can be seen more clearly visible viewed with the aid of petrographic polarizing microscopes for mineralogists. Legrandite is most commonly found showing uneven fracture when viewed under polarizing microscope for geologists. The specific gravity measure of the mineral Legrandite usually gives an approximate value of about 4.0 grams per cubic centimeters, which is considered above average for translucent minerals. The hardness measure of Legrandite when it is evaluated using the Mohs scale method is usually ranging from 4.5 to 5. Legrandite is commonly found leaving a white streak when specimen of Legrandite is rubbed on white porcelain streak plate.

 

            Most crystals of mineral Legrandite are found transparent to translucent in appearance. The crystal habit of mineral Legrandite as described in optical mineralogy usually includes prismatic to bladed crystals with a wedge shaped termination that are often complexly faceted when viewed under polarizing microscopes. Mineral Legrandite is actually pretty easy to identify. This is because no other minerals can be associated with limonite that exhibits a bright yellow color with prismatic crystals forms that are splendidly exhibited under petrographic polarizing light microscopes. However, mineral Legrandite is very rare and very hard to find. There are some so lucky enough mineral collectors that were able to possess good specimens of mineral Legrandite.

 

            Legrandite is most commonly found showing high surface relief when viewed under several adjustments on the aperture diaphragm of the geological polarizing microscopes. Legrandite is commonly found showing biaxial positive figure when the mineral is evaluated between crossed nicols of polarizing light microscope. The maximum birefringence of the mineral Legrandite is commonly found 0.060. The refractive index of the mineral is commonly found ranging from 1.675 to 1.740 when it is closely evaluated with the aid of petrographic polarizing light microscopes.  Legrandite also exhibits a strong dispersion when viewed under polarized microscope. There is no specific data found on the toxicity and health dangers for mineral Legrandite. However, the specimens of the mineral should be treated with great care and use of sensible precaution is advised upon handling them. Legrandite is a non-radioactive mineral species.

 

            Mineral Legrandite is commonly found associated with other interesting minerals such as adamite, smithsonite, aragonite, limonite, mimetite, pyrite, paradamite, sphalerite, austenite, calcite, and other oxidation zone minerals. The best field indicators of mineral Legrandite usually include luster, crystal habits, color, density, and associations. Legrandite is actually a secondary mineral in zinc ore bodies. Mineral Legrandite notably occurs at several localities including the famous mines at Mapini, Mexico and the Flor de Pena Mine, Mexico.



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Thursday, November 27th, 2008 at 3:43 am
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The Phosphates Mineral Class
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