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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of mineral Mottramite is indicated by PbCu(VO4)(OH), a Lead Copper Vanadinate Hydroxide. Mottramite is actually a Phosphate mineral. Mineral species Mottramite was named after the locality at Mottram St. Andrew, Cheshire, England where ore was stockpiled. The first specimen of the mineral was discovered in 1876 at this type of locality. Mineral Mottramite is known to crystallize in the orthorhombic system. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Mottramite is also a member of the Descloizite Group of minerals. Mottramite is also considered as a minor ore of lead and copper and is often found exhibiting nice and interesting appearance when viewed with the aid of petrographic polarizing microscopes for mineralogists. Mineral Mottramite is also in series with mineral descloizite. Mottramite is the known copper-rich end member of the series while descloizite is the zinc-rich member. Both minerals, Mottramite and descloizite, contain significant amount of both elements and they are rarely found pure.

 

Most crystals of mineral Mottramite are usually found transparent to opaque in appearance. The crystal habits of the mineral Mottramite as described in optical mineralogy usually include the typical tiny druzy crusts that are often found wonderfully displayed under petrographic polarizing microscope. It can be also found forming radiating and stalactitic masses that are usually majestically exhibited under polarizing light microscope for mineralogists. Mineral Mottramite can be actually found forming sparkling crusts that exhibits nice luster and striking green color when viewed with the aid of petrographic polarizing microscopes. Its typically high price is due to its rarity and attractiveness, which attracts one to pay for it for a fine specimen to have.

 

            Mineral Mottramite is typically found in various shades of green and rarely black that is more splendidly exhibited when viewed under petrographic polarizing microscope used in optical mineralogy. Mottramite is also most commonly found exhibiting resinous luster when closely viewed in reflected light of the geological polarizing light microscope. There is no cleavage found exhibited by the mineral Mottramite even when it is evaluated under several adjustments on the aperture diaphragm of the polarizing microscopes used in optical mineralogy. Mottramite is usually found exhibiting conchoidal to uneven fracture when viewed under petrographic polarizing light microscope for mineralogists.  The specific gravity measure of the mineral usually gives an approximate value ranging from 5.7 grams per cubic centimeters to 6.0 grams per cubic centimeters, which is considered very heavy for translucent minerals. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually ranging from 3 to 3.5. Mottramite is most commonly found leaving a green streak when it is rubbed on a white porcelain streak plate.

 

            Mottramite is most commonly found exhibiting a very high surface relief when viewed under several adjustments on the aperture diaphragm of the polarizing microscope. The maximum birefringence of the mineral is usually found 0.150. It also exhibits a visible pleochroism when viewed under petrographic polarizing light microscopes. It usually shows strong dispersion under polarized microscopes. Mottramite is known to have biaxial negative figure when it is evaluated between crossed nicols of the petrographic polarizing light microscopes. The refractive index of the mineral is usually found ranging from 2.170 to 2.320 when it is viewed under polarized light microscopes. The pleochroism exhibited by Mottramite when it is viewed with the aid if polarized microscope is usually weak to strong. This mineral Mottramite is readily soluble in acids. There is no specific data found on the toxicity and health dangers for mineral Mottramite. However, the specimens of this mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Mottramite is a non-radioactive mineral species.

 

            Mineral Mottramite is commonly found associated with other interesting minerals such as descloizite, malachite and other secondary ore minerals. The best field indicators of mineral Mottramite usually include color, crystal habit, density, and localities. Mineral Mottramite is commonly found forming at oxidation zone of vanadium bearing bases metal deposits. Mottramite notably occurs at several localities including Pina County, Arizona, USA as well as Chile, England, Bolivia and elsewhere.



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Monday, September 29th, 2008 at 2:46 am
Category:
The Phosphates Mineral Class
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