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The chemical formula of the mineral Baumhauerite is indicated by Pb3As4S9 or Lead Arsenic Sulfide. Baumhauerite is actually a Sulfide mineral. Baumhauerite mineral was first discovered in the year 1902 at Lengenbach Quarry in Binnental, Switzerland. Mineral species Baumhauerite was named after Heinrich Adolph Baumhauer (1848-1926), a German mineralogist and also a Professor at the University of Fribourg in Switzerland. This mineral Baumhauerite is synonymous with Guitermanite. Specimens of Baumhauerite mineral are usually found in shades of bright dark gray color. It is commonly found exhibiting a nice luster in reflected light of polarized microscopes used in optical mineralogy. Baumhauerite mineral crystals are usually striated prismatic, which are embedded in a Dolomite marble. This is actually considered as a very marvelous association, which exhibits splendid microscope images under a petrographic polarizing light microscope. Most serious mineral collectors consider this rare sulfide mineral Baumhauerite, as an exotic mineral. This Baumhauerite mineral is commonly associated with other interesting minerals such as sartorite, dolomite and realgar.

 

            Baumhauerite mineral specimens usually appear in a bright lead gray, blue gray to gray black in hand samples. They commonly appear white if viewed in reflected light of polarizing light microscopes for mineralogists. Its color may possibly tarnish iridescent. Internal reflections will flash a red color and this can be clearly visible when viewed with the aid of a polarizing microscope used in the field of optical mineralogy. Baumhauerite is most commonly found showing metallic to dull luster evaluated in reflected light of petrographic polarizing light microscope used in the field of optical mineralogy. Baumhauerite minerals commonly have indistinct cleavage in one direction and a perfect cleavage in the other direction hen evaluated under polarized microscopes used in the field of optical mineralogy. Cleavages can be found clearly exhibited when specimens are under several adjustments on the aperture diaphragm of polarizing light microscopes for mineralogists. Baumhauerite mineral commonly shows conchoidal fracture when evaluated under several adjustments and stage rotations on different angles using the polarizing light microscopes used in optical mineralogy. In the field of optical mineralogy, conchoidal fracture is developed in brittle materials characterized by smoothly curving surfaces, which can be found visible when examined with the aid of polarized light microscopes. Fracture describes how a mineral breaks when broken contrary to its natural cleavage planes. The hardness measure of mineral Baumhauerite using the Mohs scale method is usually found 3. When specimens of Baumhauerite mineral are rubbed on a white porcelain streak plate, they usually leave a dark brown or chocolate brown streak. The specific gravity measure of Baumhauerite mineral is commonly found as 5.3 grams per cubic centimeters, which is considered slightly heavier than average for metallic minerals.

 

            Baumhauerite minerals are known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Crystals of mineral Baumhauerite are usually found opaque in appearance. The crystal habit of this mineral as described in optical mineralogy usually includes prismatic striated crystals, which are commonly found with rounded faces that are usually exhibiting splendid microscope images when viewed with the aid of a petrographic polarizing light microscope. Specimens of Baumhauerite minerals can be also found in massive and granular forms. Baumhauerite crystals may also appear in fine crystalline form that occur as well-formed fine sized crystals, which are commonly interesting to view with the aid of polarizing light microscope for mineralogists.

 

            Baumhauerite minerals are found anisotropic under polarizing light microscope used in optical mineralogy. They usually show strong anisotrophism when viewed between crossed nicols of petrographic polarizing microscopes and they are usually found colorful in green, violet, yellow or blue-green colors. Interference color exhibited by Baumhauerite mineral under polarized light microscope is commonly white with deep red internal reflections. After several chemical tests, Baumhauerite mineral is found not radioactive. It can be also found having a polysynthetic twinning with visible twin lamellae, which can be seen clearly visible when viewed with the aid of polarizing microscopes. There is no specific data on the toxicity and health dangers for Baumhauerite mineral. However, mineral specimens of Baumhauerite should be treated with great care and use of sensible precautions upon handling them is advised. Baumhauerite mineral can be found in sugary Dolomite at Binnental, Switzerland. Best field indicators of Baumhauerite minerals commonly include density, crystal habit, internal reflections, locality and its wonderful associations with other interesting minerals. Baumhauerite are rare sulfide minerals that are only found in a few localities. It can be found with regularity in a famous quarry at Lengenbach, Binnental, Valais, Switzerland. Lengenbach is a famous site for many rare minerals that include jordanite, novakite, smythite, marrite, rathite, wallisite, dufrenoysite, seligmannite, bernardite, liveingite, lengenbachite, sartorite, arsenolamprite, hatchite and imhofite. This site commonly produces exotic mineral specimens such as arsenic sulfides and sulfosalts. Baumhauerite minerals can be also found at Franklin in New Jersey, USA.



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Tuesday, December 15th, 2009 at 2:44 pm
Category:
The Sulfides Mineral Class
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