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The chemical formula of mineral Kieserite is indicated by the formula MgSO4 – H2O or Hydrated Magnesium Sulfate. Kieserite is actually a Sulfate mineral. It is also a member of the Kieserite Group of minerals. Mineral Kieserite was named after Dietrich Georg von Kieserr, the former President of the Jena Academy. The mineral species was first described in 1861 at Stassfurt, Saxony, Germany.  Kieserite 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.

 

Mineral Kieserite is considered as a minor source of magnesium. It is also commonly used as mineral specimen and it is often found exhibiting nice and interesting microscope images under polarizing microscope used in optical mineralogy. Kieserite is also used in the production of the Epsom salt. Mineral Kieserite lends its name to the group of sulfates minerals called Kieserite Group of minerals. These sulfates are all monoclinic and they have medium sized cations and are mono-hydrated or contain one water molecule. The general formula of this Kieserite Group of minerals is indicated by ASO4 – H2O, where A can stand either magnesium, iron, manganese, nickel, copper and or zinc. Most crystals of mineral Kieserite are found translucent in appearance. The crystal habit of mineral Kieserite usually includes granular masses. It is also rarely found forming individual crystals.

 

            Mineral Kieserite is commonly found white, colorless, gray or yellowish in color and it is often found more nicely exhibited under polarized microscopes for mineralogists. Kieserite is also most often found showing vitreous luster when mineral is closely viewed in reflected light of petrographic polarizing microscope used in optical mineralogy. Kieserite is most often found showing perfect cleavage in one direction and this can be seen more clearly visible when mineral is closely evaluated under polarizing microscope for mineralogists. Kieserite also exhibits uneven fracture when viewed under polarized light microscope used in optical mineralogy. The specific gravity measure of the mineral Kieserite usually gives an approximate value of about 2.6 grams per cubic centimeters, which is considered average for translucent minerals. The hardness measure of mineral Kieserite when it is evaluated using the Mohs scale method is usually found 3.5. Kieserite is commonly found leaving a white streak when the specimen of mineral is rubbed on a white porcelain streak plate.

 

            Kieserite is commonly found showing biaxial positive figure when viewed between crossed nicols of polarizing light microscopes used in optical mineralogy. Kieserite also exhibits a low surface relief when it is evaluated under several adjustments on the aperture diaphragm of the petrographic polarizing microscope for mineralogists.  The refractive index of mineral Kieserite when it is evaluated under polarizing microscope is usually ranging from 1.520 to 1.584. The maximum birefringence of the mineral Kieserite when it is evaluated between crossed polars of petrographic polarizing microscope is commonly 0.064. The mineral has relatively strong dispersion when viewed under polarized microscopes. Specimens of mineral Kieserite should be stored in a closed container as they will absorb water from the air and convert to the mineral epsomite and if later will dehydrate, it will form the mineral hexahydrite. There is no specific data found on the toxicity and health dangers for mineral Kieserite. However, the specimens of this mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Kieserite is a non-radioactive mineral species.

 

            Mineral Kieserite is most commonly found associated with other interesting minerals such as halite, sylvite, carnallite, polyhalite and other more rare evaporite minerals. The best field indicators of mineral Kieserite usually include cleavage, environment of formation, associations, and crystal habit. Kieserite usually forms in marine evaporite deposits where seawater has been concentrated and exposed to prolonged evaporation. There are several other evaporite minerals known today. Among these are calcite, halite, dolomite, polyhalite, gypsum, sylvite, anhydrite, kainite, carnallite and picromerite. Evaporite minerals are geologically important species because they are clearly related to the environmental conditions that existed at the time of their deposition such as coastal arid. Evaporite mineral can be also easily recrystallized in laboratories in order to postulate their specific characteristics of formation. Mineral Kieserite can be also found in salt deposit of oceanic origin. Mineral Kieserite notably occurs at several localities including Saxony in Germany, Poland, Sicily in Italy, Russia, Austria, and some areas in the United States such as Carlsbad, New Mexico and Western Texas.



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Monday, February 16th, 2009 at 2:48 am
Category:
The Sulfates Mineral Class
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