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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 Dravite is indicated by NaMg3(Al, Fe)6Si6O18(BO3)(OH)4 or complex Sodium Magnesium Iron Boro-Aluminum Silicate. Dravite is actually a Silicate mineral. Mineral Dravite was first discovered from the Drava River in District of Drave in Austria. The name of the mineral Dravite was actually derived from this type of locality. Mineral Dravite is known to crystallize in the hexagonal system. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Dravite mineral is also a member of the Tourmaline Group. Dravite mineral is commonly used as mineral specimen and it is often found in any collectors mineral collections. Dravite usually exhibits nice and splendid microscope images when viewed with the aid of the petrographic polarizing light microscopes. Mineral Dravite is sometimes found formed as a rather large crystal that is well formed and well shaped when evaluated thoroughly. These large Dravite crystals are commonly considered important in a rock hounds collection.


            Mineral Dravite is commonly found in shades of light brown to dark brown color and it is often found exhibiting a wonderful appearance when closely evaluated under petrographic polarizing microscopes used in optical mineralogy. Mineral Dravite commonly shows uneven to conchoidal fracture when the mineral section is evaluated under several adjustments on the aperture diaphragm of the polarizing microscopes for mineralogists. Dravite is most commonly found exhibiting a vitreous luster when viewed in reflected light of petrographic polarizing microscopes for mineralogists. Mineral Dravite is commonly found with absent cleavage although basal partings can be possibly found when the mineral is closely examined with the aid of polarized light microscopes used in optical mineralogy. The specific gravity measure of the mineral commonly found as 3.2+ grams per cubic centimeters, which is considered heavier than average. The hardness measure of the mineral Dravite when it evaluated using the Mohs scale method is usually ranging from 7 to 7.5. When Dravite mineral section is rubbed on a white porcelain streak plate it is commonly found leaving a colorless streak.


            Most Dravite mineral crystals are found translucent to opaque in appearance. The crystal habits of mineral Dravite as described in optical mineralogy field are sometimes found having typically elongated three sided prisms. Dravite can be seen having terminations that can be either a flat basal face or a simple to complex trigonal pyramid when closely evaluated with the aid if the polarized microscope for geologists. It can be found that the prism faces are striated lengthwise when the mineral section of Dravite is evaluated under polarizing microscopes mineralogists. Almost all tourmalines appear predominantly triangular in shape with some hexagonal crystal forms when Dravite cross sections are examined under polarized microscopes. Crystals that are doubly terminated are called hemimorphic. In optical mineralogy, this means that the ends of the Dravite crystals are not exactly alike. Dravite mineral can be also found in massive form.


            Mineral Dravite is commonly found showing a uniaxial negative figure when it is evaluated between crossed nicols of polarized light microscopes used in optical mineralogy. Crystals of mineral Dravite as described in optical mineralogy are usually brittle. Mineral Dravite has refractive indices found from 1.62 to 1.68 when evaluated in plane-polarized light of polarizing light microscopes for mineralogists. Dravite mineral shows pleochroic colors in different shades of yellow and this can be more fascinating to view under polarized microscopes for geologists. The birefringence display of mineral Dravite is commonly found ranging from 0.0190 to 0.0250. Dravite is a nonradioactive mineral.


            Mineral Dravite is commonly associated with several other interesting minerals like quartz, micas and feldspars. The best field indicators of mineral Dravite usually include triangular cross section, crystal habit, color and hardness. Mineral Dravite commonly occurs at some metasomatically altered magnesian or dolomitic limestones found in the contact-metamorphic aureoles. It can be also found in pegmatites and granites and also in some metamorphic rocks. Mineral Dravite notably occur at some famous mineral localities including Brazil and some other countries in America as well as Africa.

Thursday, August 28th, 2008 at 3:22 am
The Silicates Mineral Class
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Click Here For Best Selection Of High Quality Polarizing Microscope