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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of the mineral Galena is indicated by PbS or Lead Sulfide. Galena is actually a Sulfide mineral. The name of the mineral originated from Pliny, the Roman naturalist, who used the name galena to describe lead ore. Galena is known to crystallize in the isometric system. In optical mineralogy, this isometric system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. Galena is the most common member of the Galena Group of Minerals. Galena is considered as the most major ore of lead and silver. It is most commonly found exhibiting nice and fascinating microscope appearance when viewed under an ore polarizing light microscopes. Mineral Galena is also used as mineral specimen and it most often found showing interesting microscope images when evaluated with the aid of polarizing microscopes for geologists. Mineral Galena is actually the most popular and the most common mineral for rock hounds. When evaluated under petrographic polarizing microscopes, it can be found easy to identify using its distinctive cleavage, high density and its characteristic cubes. The Galena mineral specimen is actually the favorite in high school geology laboratories.


When Galena mineral crystals are evaluated under polarized light microscopes, it is commonly found having identical structure to mineral Halite. Halite and Galena have the same crystal shapes, cleavage and symmetry as proven in the field of optical mineralogy and this can be viewed clearly and more easily observed when they are evaluated with the aid of petrographic polarizing microscope for mineralogists or with the use of the comparison polarizing microscope. Some mineral Galena may be found containing up to 1 percent silver in place of lead. If the large volume of mineral Galena is processed in order to produce lead, enough silver can be also produced as by-product and this also makes mineral Galena as a leading ore of silver. Galena also acts as a natural semiconductor many years ago. And it is actually considered the forerunner of all the modern electronic gadgets and medical equipments that we all use today.


            Mineral Galena is commonly found exhibiting a lead gray to silver gray color when viewed under geological polarizing light microscopes. Sometimes it can be found with a bluish tint that can be very interesting when viewed with the aid of polarized light microscopes. Galena is most commonly found exhibiting a metallic to dull luster in weathered faces of the crystal when it is examined closely in reflected light of petrographic polarizing microscope. Also, Galena crystals are usually found exhibiting a metallic luster on cleavage surfaces than on crystal surfaces are evaluated in reflected light of polarized microscopes. Galena is most commonly found exhibiting a perfect cleavage in four directions forming cubes and it can be seen splendidly exhibited under petrographic polarizing light microscopes for mineralogists. Galena also exhibits uneven fracture most especially when it is closely evaluated under polarized light microscopes used in optical mineralogy. But this fracture is rarely seen because of the perfect cleavage of the Galena crystals that is most often found more clearly visible when evaluated with the aid of the polarizing microscopes for geologists. The specific gravity measure of the mineral usually gives an approximate value of about 7.5+ grams per cubic centimeters, which is considered heavy even for metallic minerals. The hardness measure of mineral Galena when it is evaluated using the Mohs scale method is usually found 2.5. Galena is most commonly found leaving a lead gray streak when it is rubbed on a white porcelain streak plate.


            Most Galena mineral crystals are found opaque in appearance. The crystal habits of mineral Galena as described in optical mineralogy field usually include the cube, octahedron and combinations of the two that can be found interestingly exhibited under geological polarizing microscopes. Spinel twinning can be also found exhibited by the mineral when the section is closely evaluated under petrographic polarizing light microscope. As described in optical mineralogy, the spinel twinning can be actually found forming the flattened crystals of mineral Galena that can be clearly visible when viewed with the aid of polarizing microscopes for geologists. Some mineral Galena can be found massive and granular in form. Galena is a nonmagnetic mineral. There is no specific data found on the toxicity and health dangers for mineral Galena. However, the specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them. Mineral Galena is not radioactive.


            Mineral Galena is commonly associated with other minerals like calcite, pyrite, dolomite, sphalerite and other sulfide minerals as well some lead oxidation minerals like cerussite and anglesite. The best field indicators of mineral Galena include cleavage, crystal habit, and probably the most significant, density.  Mineral Galena can be found in lead sulfide ore veins and disseminated in igneous and sedimentary rocks. Mineral Galena notably occurs at some types of localities such as Germany, England, Mexico, Peru, Zambia and the Texas-Oklahoma-Missouri area in the United States.

Monday, September 29th, 2008 at 2:46 am
The Sulfides Mineral Class
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Click Here For Best Selection Of High Quality Polarizing Microscope