Leave a message
Mon
30
Nov

Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of mineral Betafite is indicated by  (Ca,Na,U)2(Ti,Nb,Ta)2O6(OH,F) or Calcium Sodium Uranium Titanium Niobium Tantalum Oxide Hydroxide Fluoride. Betafite actually belongs to the Oxides and Hydroxides mineral class. Betafite mineral is also a member of the Pyrochlore group. Mineral Betafite was first discovered in the year 1912 at Ambolotara, Betafo Department, Antananarivo Province, Madagascar. This Betafite mineral was named after the type of locality. Betafite mineral is synonymous with Samiresite, Blomstrandite and Mendeleyevite. Mineral Betafite is considered as a popular uranium-bearing mineral for most serous mineral collectors. This Betafite is one of those uranium-bearing minerals, which are known to form nice, splendid and well-shaped crystals. Betafite minerals have rare earth elements such as thorium in its chemical formula. Betafite is also considered as one of the rare earth oxides.

 

            Betafite minerals are commonly considered as popular and interesting minerals that exhibits splendid images under polarizing microscope used in the field of optical mineralogy. Its large and well-formed crystals make up for its popularity even if it lacks color. Mineral Betafite is known to crystallize in the isometric symmetry class, which can be seen clearly visible under a polarizing light microscope for mineralogists. 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. It usually forms large octahedral and dodecahedral crystals that are found weighing up to 100 kilograms. Frequently, they can be modified by some other isometric forms and/or flattened when two opposing faces are found dominating the crystal and this can be seen clearly visible under petrographic polarizing light microscopes. Those well-formed Betafite crystals are considered classics in the mineral world. Betafite mineral is commonly associated with several other minerals such as rocks quartz, allanite, feldspars, zircon, columbite, thorite, tantalite, biotite, fergusonite and some other rare earth minerals.

 

            Betafite mineral specimens are usually found black in appearance and commonly with a tint of yellow, green or brown when viewed under polarized light microscopes used in optical mineralogy. Betafite commonly shows earthy to metallic luster when evaluated in reflected light of petrographic polarizing microscope used in optical mineralogy field. They may sometimes appear vitreous in reflected light of polarizing microscope for mineralogists when crystals appear translucent. Betafite is found having an absent cleavage when mineral specimen is evaluated under several adjustments on the aperture diaphragm of the polarized light microscopes used in the field of optical mineralogy. The fracture found for mineral specimen Betafite is commonly found conchoidal when it is viewed with the aid of a petrographic polarizing microscope for mineralogists. In the field of optical mineralogy, conchoidal fractures are developed in brittle materials characterized by smoothly curving surfaces. The hardness measure of Betafite mineral specimen using the Mohs scale method is usually found ranging from 4 to 5.5. When specimen of Betafite mineral is rubbed on a white porcelain streak plate, it usually leaves a yellow to brown streak. The specific gravity measure of Betafite commonly gives an approximate value usually found ranging from 3.7 grams per cubic centimeters to 5.0 grams per cubic centimeters, which is commonly considered heavy for non-metallic and average for metallic minerals. The extreme variation is caused by variable composition of components metals.

 

            Betafite crystals are generally found opaque in appearance. But some Betafite minerals are also found as translucent specimens. Betafite minerals are commonly found crystallizing in the isometric system, which can be seen clearly visible under a polarizing light microscope for mineralogists. This isometric system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. Crystal habits of Betafite commonly include octahedral and dodecahedral crystals, which are often modified by other isometric forms and/or flattened when two opposing faces are found dominating the crystal, which can be seen clearly visible when viewed under a polarizing microscope used in the field of optical mineralogy. They can be also found in granular forms and also as massive crystals, which commonly shows splendid microscope image under a polarized light microscope. These are the common texture observed in granite and other igneous rocks. Betafite mineral specimens are often found with a yellow or green earthy coating. Betafite crystals can be also found as encrustrations that are commonly formed as crust-like aggregates on matrix, which commonly shows magnificent microscope views under a polarizing light microscope for mineralogists. Betafite minerals are usually found isotropic when viewed between crossed nicols of petrographic polarizing light microscopes used in optical mineralogy. The interference color found is almost colorless under polarizing microscope for mineralogists. Betafite commonly shows a high surface relief when viewed with the aid of polarized light microscope used in the field of optical mineralogy. Betafite minerals are considered radioactive and it is highly recommended that they must be stored away from other minerals that are subject to damage from radioactivity. Human exposure should also be limited.

 

            Betafite mineral specimens are commonly found forming in rare earth rich granite pegmatites. They can be also found in a slow cooling igneous intrusive rock such as the ones that are found from the site Betafo, Malagasy Republic in Madagascar. It can be also possibly found in the contact metamorphic marbles that surround these pegmatites. Best field indicators of Betafite minerals usually include color, crystal habit, fracture, environment, radioactivity, luster, specific gravity and its splendid association with some other interesting minerals. Betafite minerals notably occur at some types of localities including Silver Crater Mine, Bancroft in Ontario, Canada and Brazil as well as Russia, Spain, Peru, India, Pakistan, Norway, California, New Mexico, Arizona and Colorado, USA.



Author:
Time:
Monday, November 30th, 2009 at 4:50 am
Category:
The Oxides and Hydroxides Mineral Class
RSS:
You can follow any responses to this entry through the RSS 2.0 feed.
Navigation:
Click Here For Best Selection Of High Quality Polarizing Microscope