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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Picromerite is indicated by K2Mg(SO4)2 – 6H2O or Hydrated Potassium Magnesium Sulfate. Picromerite is actually a Sulfate mineral. It is also considered as a minor source of magnesium. Picromerite is most commonly used as mineral specimen. It is also known as schoenite. Specimens of mineral Picromerite dehydrates in dry air forming the mineral langbeinite and sample will eventually turn cloudy. Thus, Picromerite specimens should be stored in sealed containers.

             Picromerite is most commonly found white colorless, reddish, gray or yellowish in color and it can be seen more splendidly exhibited when viewed with the aid of polarizing microscopes used in optical mineralogy. Picromerite is also most commonly found showing vitreous luster when viewed n reflected light of petrographic polarizing microscopes. Picromerite specimens are usually found translucent to opaque in appearance. Picromerite is also 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 Picromerite as described in the field of optical mineralogy usually includes granular, earth and encrusting masses. Individual short prismatic Picromerite crystals are rare in occurrence. Picromerite is most commonly found showing perfect cleavage when closely evaluated under polarizing microscope for mineralogists. It also exhibits conchoidal fracture when viewed with the aid of polarized microscopes used in optical mineralogy. The hardness measure of mineral Picromerite when it is evaluated using the Mohs scale method is usually 2.5. Picromerite is also most commonly found leaving a white streak when specimen sample is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 2.0 grams per cubic centimeters to 2.1 grams per cubic centimeters, which is considered light even for translucent minerals. Picromerite is known to have bitter taste. The best field indicators of mineral Picromerite usually include density, association, and environment of formation as well as fracture and habit. Picromerite is most commonly found forming in marine evaporite deposits where sea water has been concentrated and exposed to prolonged evaporation. Evaporite minerals are said to be geologically important because they clearly are related to the environmental conditions that existed at the time of their arid deposition. They can also be easily recrystallized in laboratories enabling sedimentologists to obtain their specific characteristics of formation. Picromerite is also found as a crusty deposit around fumaroles and in some dry caves. Picromerite is also most commonly found associated with other interesting minerals including trona, alunite, blodite, halite, sylvite, thernardite and other more rare evaporite minerals. Picromerite notably occurs at several localities including Sicily, Italy, Poland and Germany.



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Monday, June 29th, 2009 at 2:32 pm
Category:
The Sulfates Mineral Class
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