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The chemical formula of mineral Boulangerite is indicated by Pb5Sb4S11 or Lead Antimony Sulfide. Boulangerite is actually a Sulfide mineral. Boulangerite mineral is considered as one of the few sulfide minerals. This mineral species Boulangerite was first discovered in the year 1837 in France. Boulangerite mineral was actually named after Charles L. Boulanger (1810-1849), a French mining engineer. Boulangerite mineral is considered as one of the few sulfide minerals. Boulangerite is commonly found in forms of fine acicular crystals, which usually appear as hair like fibers when viewed under a geological microscope. Sometimes a mineral specimen can be seen covered with hair like fibers due to the fibrous aggregates of Boulangerite that are usually found so thick. It can be also found sparsely disseminated between other minerals and sometimes it can be confused with actual hairs or dark lint. There are two other sulfide minerals, which are usually found forming similar acicular crystals. These sulfide minerals are the Jamesonite and the Millerite. These two minerals can be actually mistaken for Boulangerite. However, they can be distinguished from Boulangerite through the yellow color that is commonly displayed by millerite and the brittleness of the jamesonite crystals.

 

            Boulangerite minerals are also considered members of the sulfosalt. Sulfosalts are segments of the sulfides mineral class where the antimony content acts more like a metal rather than a non-metal. And it is commonly found occupying the position where it is usually bonded to sulfurs. It has been also known that jamesonite and also Boulangerite have been called as feather ores. Mineral Plumosite, a variety of Boulangerite was named that way due to its crystal habit, which is usually plumose or feathery. It was actually been thought to be a different mineral. Boulangerite minerals are commonly used as minor ores of lead. Boulangerite ore minerals are actually fascinating to view under an ore polarizing light microscope. Boulangerite are also used as mineral specimens.

 

            Boulangerite minerals are usually found in shades of blue lead gray to gray in reflected light of polarized microscope used in the field of optical mineralogy. The luster that is often found exhibited by Boulangerite in reflected light of petrographic polarizing microscope for mineralogists is either metallic or silky. When Boulangerite mineral specimen is evaluated between crossed nicols of petrographic polarizing microscope used in the field of optical mineralogy, it commonly displays a good cleavage in one direction that is parallel to the length. The fracture found under several adjustments on the aperture diaphragm of polarizing light microscope for mineralogists is commonly uneven. The fracture actually describes how a mineral breaks when broken contrary to its natural cleavage planes. The hardness measure of Boulangerite mineral using the Mohs scale method is usually found as 2.5. Boulangerite specimens are usually found leaving a gray to brown streak when rubbed on the white streak plate. The specific gravity measure of mineral specimen Boulangerite is commonly found in values ranging from 5.8 to 6.2 grams per cubic centimeters, which is commonly considered heavier that average for metallic minerals.

 

            Boulangerite is known to crystallize in the monoclinic system of crystal formation. In the field of 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. Boulangerite crystals are commonly found opaque in appearance. The crystal habits of Boulangerite minerals usually include dense or sparse felted masses of acicular crystals that can be made clearly visible with the aid of polarizing microscope for mineralogists. Acicular crystal habit occurs as needle like crystals. They can be also found in fibrous forms, which are interesting to view under polarized light microscope used in optical mineralogy. They may actually appear in massive fibrous crystals, which are distinctly fibrous fine-grained forms. Sometimes, they can be also found in form of compact plumose or feathery masses that are usually displaying fascinating microscope images under petrographic polarizing microscopes for mineralogists. Plumose or mica like minerals usually forms aggregates of plume-like crystals. Boulangerite crystals are also brittle, a property that is commonly displayed by glasses and most non-metallic minerals. Boulangerite minerals are commonly associated with several interesting minerals that include galena, pyrite, arsenopyrite, siderite, quartz and sphalerite.

 

            Boulangerite mineral is found to be distinctly anisotropic between crossed nicols of petrographic polarizing light microscope. When Boulangerite mineral specimen is evaluated in polarizing light microscope for geologists, it is usually found weakly pleochroic. Boulangerite crystals are considered very flexible. Boulangerite minerals do not react with cold weak acids. But they are commonly found easily dissolved in hot strong acids. They also fuse very easily. Boulangerite mineral specimens are not magnetic. They are also found as not radioactive minerals after several chemical evaluations. Boulangerite minerals are commonly formed in medium and low temperature ore deposits. They are commonly found in hydrothermal veins. They can be also found present in lead ore deposits. The best field indicators of Boulangerite commonly include color, flexibility, crystal habit, luster, and its fascinating association with several other interesting minerals. Boulangerite minerals notably occur at some types of localities including several areas in the United States such as Colorado, Nevada, Washington, Idaho and Montana as well as several other localities like Mexico, China, Germany, Pribram, Trepca and Sweden.



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Friday, January 15th, 2010 at 4:44 am
Category:
The Sulfides Mineral Class
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