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The chemical formula of mineral Thaumasite is indicated by the formula Ca3Si(CO3)(SO4)(OH)6 – 12H2O or Hydrated Calcium Silicon Carbonate Sulfate Hydroxide. Thaumasite is actually a Sulfate mineral. It is most commonly used as mineral specimen and is often found exhibiting nice and interesting microscope images when viewed with the aid of petrographic polarizing light microscopes for mineralogists. Thaumasite is also considered as a fairly rare mineral whose classification and chemistry is both interesting. There can be instances when it is classified as a Silicate due to its silicon content. However, there are arguments made for its classification as Carbonate as well. However, it does not belong to a predominantly sulfate mineral group. Its properties are found more in line with its inclusion into the sulfate class. It is also very interesting to note that four out of every five atoms in this mineral is either a part of a water molecule or an hydroxide. It is actually almost water. The fact is reflected in its very low specific gravity of only 1.9 grams per cubic centimeters, that is less than twice the density of water.

 

            Thaumasite is most commonly found colorless or white in appearance. It is also usually found showing nice and interesting microscope images when viewed with the aid of petrographic polarizing light microscopes for mineralogists. Thaumasite is also most commonly found showing vitreous luster when viewed in reflected light of polarizing microscope used in the field of optical mineralogy. Most crystals of mineral Thaumasite are found translucent in appearance. Thaumasite is also known to crystallize in the trigonal system of crystal formation. The crystal habits of the mineral Thaumasite as described in the field of optical mineralogy usually include acicular crystals and massive forms.

 

            Thaumasite is also found showing poor and rarely seen cleavage when closely evaluated with the aid of petrographic polarizing light microscopes for mineralogists. Thaumasite is also usually found showing uneven fracture when viewed under polarized microscopes for mineralogists. The hardness measure of mineral Thaumasite when it is evaluated using the Mohs scale method is usually 3.5. Thaumasite is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. The specific gravity measure of Thaumasite is approximately 1.9 grams per cubic centimeters, which is well below average. Thaumasite is most commonly found associated with spurrite. The best field indicators of mineral Thaumasite usually include association, density and hardness. Thaumasite notably occurs at Langban, Sweden as well as Crestmore, Riverside Co., California and Paterson, New Jersey, USA.

 



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Thursday, August 13th, 2009 at 2:20 pm
Category:
The Sulfates Mineral Class
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