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The chemical formula of mineral Rosasite is indicated by (Cu, Zn)2CO3(OH)2 or Copper Zinc Carbonate Hydroxide. Rosasite is actually a Carbonate mineral. This mineral is also considered as a very minor ore of zinc and copper. It is also commonly used as mineral specimen and it usually exhibits nice and interesting microscope image under polarizing microscope used in optical mineralogy. Mineral Rosasite is most commonly found exhibiting an attractive bluish green color that can be seen more fascinating when evaluated with the aid of polarized microscope used in the field of optical mineralogy. Rosasite is usually associated with red limonite and other such colorful minerals as aurichalcite, hemimorphite and smithsonite. It is also interesting to note that nodules of mineral Rosasite certainly add color to what are termed to be landscape specimens in the optical mineralogy. It should be also noted that mineral Rosasite is most commonly confused with aurichalcite. However, mineral Rosasite is more commonly found massive but not lamellar. It should be also noted that Rosasite crystals are harder than aurichalcite.

             Mineral Rosasite is usually found bluish green to green in color that could appear more fascinating when evaluated under polarizing microscopes used in the field of optical mineralogy. Rosasite is also usually found showing silky to vitreous to dull luster for massive specimens when evaluated in reflected light of polarized microscopes for mineralogists. Rosasite mineral crystals are most commonly found transparent to translucent in appearance. Rosasite 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. 

            The crystal habit of mineral Rosasite as described in the field of optical mineralogy is usually found in form of fibrous crystals that are more splendidly and amazingly wonderful when viewed under petrographic polarizing light microscopes for mineralogists. It can be actually found as tufted aggregates that can be more interesting under polarized microscope for geologists. However, Rosasite mineral crystals are more typically found as crusts and botryoidal masses or nodules. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually 4. When Rosasite is closely evaluated with the aid of petrographic polarizing microscope, it is most commonly found showing perfect cleavage in one direction but this is not usually noticed because of fibrous crystal habit. The specific gravity measure of the mineral is approximately 4 grams per cubic centimeters, which is somewhat heavy for nonmetallic minerals. Mineral Rosasite is also usually found showing fibrous fracture when viewed under polarized microscope. Rosasite is also most commonly found leaving pale shades of bluish green or green streak when specimen is rubbed on a white porcelain streak plate.

 

            Mineral Rosasite is most commonly found forming in oxidation zones of zinc-copper deposits and it is usually found as crusts and botryoidal masses or nodules that can be more interesting when viewed under polarizing light microscopes used in the field of optical mineralogy. Rosasite is usually found associated with other interesting minerals including limonite, calcite, smithsonite, malachite, aurichalcite and hemimorphite. Mineral Rosasite also effervesceses easily in cold dilute hydrochloric acid. The best field indicators of mineral Rosasite include color, hardness, crystal habit, associations and reaction to acid. Mineral Rosasite notably occurs at several localities including Sardinia in Italy, Tsumeb in Namibia, Durango in Mexico and some areas in USA including Arizona, New Mexico and Inyo Co., California.



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Tuesday, July 14th, 2009 at 2:28 pm
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The Carbonates and Borates Mineral Class
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