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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 Antlerite is indicated by Cu3SO4(OH)4 or Copper Sulfate Hydroxide. Antlerite is actually a Sulfate mineral. Antlerite was first discovered as the chief ore at the Chuquicamata Copper Mines in Chile. After the reported first discovery, Antlerite is found in large deposits at several copper mining areas around the world. The specimen was named after the type of locality Antler Mine, Arrastra Mt., Hualapai Mts., Mohave Co. Arizona, USA. It was discovered in the year 1889. This Antlerite mineral 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. Antlerite was once considered as a relatively rare mineral. Antlerite is considered as an important ore of copper and it is most often found exhibiting a nice and interesting microscope appearance when viewed under ore polarizing microscope. Antlerite commonly forms crystals that are usually greatly appreciated by most mineral collectors.


            Antlerite specimen in deep green color is the most attractive shade exhibited by the mineral under polarized light microscopes for mineralogists. Antlerite commonly appears in bright emerald green color that is more splendidly exhibited under petrographic polarizing microscopes for geologists. Antlerite may also display dark green to almost black color at some instances when it is viewed under petrographic polarizing microscope. Antlerite is most commonly found exhibiting a perfect cleavage in one direction and good in the other direction when it is evaluated between crossed nicols of polarizing light microscope. Cleavages can be best observed by slightly lowering the condensing lens of petrographic polarizing microscope just above the sample mineral section of Antlerite. Antlerite is most commonly found leaving a pale green streak when it is rubbed on a white porcelain streak plate. The specific gravity of the mineral specimen is approximately 3.9 grams per cubic centimeters, which is considered average for translucent minerals. Antlerite is usually found exhibiting a vitreous luster if evaluated in reflected light of petrographic polarizing microscope. Antlerite also shows uneven fracture when it is viewed under several adjustments on the aperture diaphragm of the polarizing microscopes used in optical mineralogy. A hardness measure of mineral Antlerite using the Mohs scale method is usually 3.5. When evaluated chemically, Antlerite does not effervesce in hydrochloric acid.


Antlerite crystals are most commonly found transparent to translucent in appearance. Antlerite commonly occur bipyramidal under petrographic polarizing microscope. Antlerite is also usually found with small tabular crystal inclusions when viewed between crossed nicols of polarizing light microscopes for mineralogists. Sometimes Antlerite may also appear fibrous, massive, and granular in form. Some Antlerite varieties appear in green plates on a gray matrix under petrographic polarizing light microscopes. It commonly appears in aggregates acicular crystal forms that are usually organized randomly as coatings and tufts that are usually beautifully exhibited under polarized light microscopes. There can be possible appearance of high crystal forms that are commonly composed of mats of overlapping tabular crystals, which can be made visible under high magnification of polarizing light microscope used in optical mineralogy. Unusual forms can be found exhibited in only one Antlerite mineral specimen. A majestic show off of numerous dark green crystals in transmitted light of petrographic polarizing microscope shows inclusions of flattened acicular crystal forms. These color and form are usually found in contrast formation but do produce a splendid and fascinating specimen under polarized light microscopes. Antlerite mineral crystals may also appear equant that are usually visible in transmitted light of polarizing microscopes. Antlerite is commonly found showing vertically striated crystals when examined between crossed nicols of petrographic polarizing light microscope. As described in optical mineralogy, the tenacity of Antlerite is commonly brittle.


            Antlerite mineral is commonly found having a biaxial positive figure when viewed between crossed nicols of polarized light microscopes. They commonly show high surface relief when evaluated under several adjustments on the aperture diaphragm of polarizing microscope. It commonly shows strong refraction when viewed in plane-polarized light of geological polarizing microscope. When this mineral specimen is viewed between crossed nicols of polarized microscope, it commonly displays distinct dark contours and a rough or shagreened surface that has bright illumination and usually appears to stand out above the surfaces of the surrounding minerals with weaker refraction. The dispersion found when Antlerite mineral is evaluated between crossed nicols of polarizing light microscope is relatively strong. The refractive index found is usually ranging from 1.72 – 1.78 when the mineral is examined in plane-polarized light of petrographic polarizing microscope. Pleochroic colors exhibited by mineral Antlerite are usually in various shades of green when viewed in plane-polarized light of polarizing microscope for mineralogists. In optical mineralogy, mineral Antlerite is described as trichroic showing theoretically three differences of color produced by rays with vibration directions corresponding very nearly to those of the three of the three vibration directions. As the stage of petrographic polarizing microscope is revolved carrying the section of mineral Antlerite, a change in shades of green color can be noticed.


            Antlerite is similar to other green copper minerals formed in oxidation zones like malachite, brochantite, and atacamite. This mineral Antlerite is commonly associated with minerals like gypsum, atacamite, brochantite, azurite, limonite, malachite, cuprite, and chalcanthite. Mineral Antlerite is commonly formed in the oxidation zones of primary copper deposits. It is usually formed along with the oxidation of other minerals from the oxidations of copper ore minerals. They are usually found in veins as reniform, granular, or massive mineral specimens. This Antlerite mineral is usually found in secondary, weathered zones of carbonate-poor copper deposits in arid regions. It is commonly found in types of localities like Arizona, New Mexico, Bisbee, Nevada, Utah, and California, USA. Notable occurrences were also reported in Chile, and at the Antler Mine in Mexico.

Monday, September 29th, 2008 at 2:43 am
The Sulfates Mineral Class
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Click Here For Best Selection Of High Quality Polarizing Microscope