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 the mineral Aeschynite is indicated by (Y,Ca,Fe,Th)(Ti,Nb)2(O,OH)6, an Yttrium Calcium Iron Thorium Titanium Niobium Oxide Hydroxide. This Aeschynite belongs to the Oxides and Hydroxides mineral class. Aeschynite is synonymous to priote and blomstrandine. This mineral Aeschynite belongs to the group called Rare Earth Oxides. Those elements not used by other minerals in their composition gathered together under known conditions to form the rare earth oxides. The name origin of the mineral Aeschynite is the Greek word for shame. This is relative to the inability of the chemist to separate some constituents of the mineral at the time it was discovered. Another point of consideration is its chemical composition. When viewed under a petrographic polarizing microscope used in the field of optical mineralogy, several color varieties are beautifully exhibited. It usually displays pleochroic colors of black to dark brown when viewed in plane-polarized light of petrographic polarizing microscopes used in the field of optical mineralogy. Smaller crystal however, shows yellowish brown color when examined under polarizing microscopes for mineralogists.

 

            Aeschynite mineral is known to crystallize in the orthorhombic system, which can be seen clearly visible when the mineral is viewed under petrographic polarizing light microscopes for mineralogists. This crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Crystal appearances under polarizing microscope in optical mineralogy are if in massive formation and translucent if in small crystal formation. There can also be an inclusion of tabular to prismatic crystals, which can be seen when viewed under petrographic polarizing microscopes for mineralogists. Sometimes crystals tend to appear equant, while others appear to be domal and well formed when evaluated with the aid of polarizing light microscopes used in the field of optical mineralogy. They often appear splendidly embedded in pegmatic host rocks. They are commonly found in granular and massive forms.

 

            The luster shown by mineral Aeschynite may vary from vitreous to adamantine when viewed in reflected light of a polarized light microscope used in the field of optical mineralogy. Sometimes if its formation is massive, it shows pitchy luster. Mineral Aeschynite has no cleavage even when it is evaluated under several adjustments on the aperture diaphragm of petrographic polarizing microscope used in optical mineralogy. However, conchoidal fracture is highly visible when the mineral is examined under several stage and aperture adjustments made on polarizing microscopes for mineralogists. The hardness measure of the mineral using the Mohs scale method is usually ranging from 5 to 6 giving an average of 5.5. The specific gravity measure is approximately 4.9 grams per cubic centimeters to 5.1 grams per cubic centimeters, which is considered heavy for non-metallic minerals even at 5 grams per cubic centimeters average. Streak is reddish brown and sometimes reddish yellow in appearance if the mineral is rubbed on a white porcelain streak plate.

 

            This mineral is considered optically isotropic or singly refractive. Isotropic means the mineral section has no power to produce any illumination and they consequently appear dark when viewed in different angles and stage rotations of petrographic polarizing microscope used in the field of optical mineralogy. They exhibit very weak pleochroism when viewed in plane-polarized light of petrographic polarizing microscope used in the field of optical mineralogy. Aeschynite is commonly found as constituent of some slow cooling igneous intrusive rocks like some rare earth rich granite pegmatites.



Author:
Time:
Monday, November 30th, 2009 at 4:29 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