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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 Roselite is indicated by Ca2(Co,Mg)(AsO4)2 – 2H2O or Hydrated Calcium Cobalt Magnesium Arsenate. This Roselite is actually a Phosphate mineral. Roselite is most commonly used as mineral specimen and it is most often found exhibiting nice and fascinating microscope images when viewed with the aid of petrographic polarizing light microscopes. Roselite is a very beautiful mineral that is usually found splendidly colored showing fascinating rose red to pink color that can be seen more wonderful when viewed under polarized microscope. Actually, it would be a misguided assumption that its name came from its color. Mineral Roselite is actually named for a German eighteenth century mineralogists, Gustav Rose. It should be noted that the color of the mineral Roselite comes from cobalt, which is the same coloring agent as of many other different colorful minerals. Mineral Erythrite for instance is another rose colored mineral that is most often associated with Rosalite. Erythrite is actually easily confused with Roselite except for the micaceous cleavage of Erythrite.


            Mineral Roselite is found to be in a solid solution series with wendwilsonite. In the field of optical mineralogy, a solid solution series is a situation in which two or more elements are able to occupy the same position in the structures of two or more minerals. It is also found dimorphous with the much rarer Beta-Roselite. In optical mineralogy, dimoprhous means that the two minerals have different structure yet they have the same formula. Roselite is a popular collection mineral, although scarce. Roselite is also considered as a nice thumbnail mineral because it is usually found forming crystals that are so colorful yet so small and complex that appears more attractive and fascinating when viewed under polarizing light microscopes used in the field of optical mineralogy.

             Mineral Roselite is most commonly found rose-red to dark pink in color that could appear lighter with the decreasing cobalt content but would still appear very fascinating and splendidly wonderful when viewed with the aid of polarized light microscope used in the field of optical mineralogy. Mineral Roselite is also most commonly found showing vitreous luster when viewed in reflected light of polarizing microscopes for mineralogists. Roselite is usually found transparent to translucent in appearance. Roselite 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 Roselite as described in the field of optical mineralogy usually include small prismatic to tabular that are often complex crystals as well as spherical aggregates and massive crusts. Roselite crystals are sometimes found twinned and this usually adds to the complexity of the crystals. Mineral Roselite is most often found showing perfect cleavage in only one direction that can be seen more clearly exhibited when specimen is viewed closely with the aid of polarizing microscope used in optical mineralogy. Roselite is also known to exhibit uneven fracture when viewed under polarizing microscope for mineralogists. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually found 3.5 Mineral Roselite is also most commonly found leaving a light red streak when specimen sample is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 3.5 to 3.7 grams per cubic centimeters, which is considered above average for translucent minerals. The best field indicators of mineral Roselite include crystal habit, color, cleavage, streak, association with other cobalt ores and density. Mineral Roselite is also most often found associated with other interesting minerals including erythrite, limonite and beta-roselite. Roselite notably occurs at several localities including Rappold Mine, Schneeberg, Saxony as well as Morocco and Saxony, Germany. 

Tuesday, July 14th, 2009 at 2:30 pm
The Phosphates Mineral Class
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