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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Thorogummite is indicated by (Th, U)2(SiO4)(2-x)(OH)4x or Thorium Uranium Silicate Hydroxide. Thorogummite is actually a Silicate mineral. It is also considered as a very minor ore or thorium and uranium. Thorogummite is also used as a mineral specimen and it is often found exhibiting nice and interesting images when viewed with the aid of petrographic polarizing microscope used in the field of optical mineralogy. Thorogummite is once considered as a variety of thorite. It is actually a product of the alteration of thorite. It has been found that this alteration of thorite is caused by hydration facilitated by metamictation. Specimens are often metamict because thorite is highly radioactive. This condition of radioactive minerals results from the destructive effects of its own radiation on its crystal lattice. The effect can actually destroy a crystal lattice completely while leaving the outward appearance unchanged. The hydration of the structure can occur during this process and a new mineral is formed called Thorogummite.


            Thorogummite is considered as a very minor ore of thorium due to its association withy thorite. Specimens of thorite and therefore Thorogummite are generally come from igneous pegmatites and volcanic extrusive rocks, hydrothermal veins and contact metamorphic rocks. Thorogummite does not form well shaped crystals unless the outward morphology of the thorite crystal is left intact because of the fact that it is an alteration product of thorite. Therefore, the implication is that the specimen of Thorogummite is a pseudomorph of thorite. It should be also noted that Thorogummite minerals should be stored away from other minerals that are subject to damage from radioactivity and human exposure should also be limited.


            Thorogummite is most commonly found pale yellow or white in color which can be seen more fascinating and more interesting when viewed with the aid of polarizing light microscopes for mineralogists. Thorogummite is also usually found showing earthy luster when viewed in reflected light of petrographic polarizing light microscopes used in the field of optical mineralogy. Thorogummite specimens are most commonly found opaque in appearance. Thorogummite is also known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. The crystal habit of mineral Thorogummite as described in the field of optical mineralogy usually include earthy masses and pseudomorphs of thorite which are usually found as short prismatic crystals with a square cross-section and simple pyramidal terminations.


            Thorogummite has absent cleavage even when it is evaluated using the petrographic polarizing microscopes for mineralogists. It also exhibits an earthy luster when specimens are evaluated using the polarized microscope used in optical mineralogy. The hardness measure of mineral Thorogummite when it is evaluated using the Mohs scale method is usually found 1. Thorogummite is most commonly found leaving a pale yellow to white streak when specimen sample is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral Thorogummite is usually found 4.1 to 4.5 grams per cubic centimeters. Thorogummite mineral is always metamict and strongly radioactive. The best field indicators of mineral Thorogummite usually include color, radioactivity, luster and association with thorite. Thorogummite is most commonly found associated with other interesting minerals including biotite, betafite, quartz, thorite and feldspars. Thorogummite notably occurs at Langensundfjord, Norway and other thorite localities.

Thursday, August 13th, 2009 at 2:24 pm
The Silicates Mineral Class
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