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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical of the mineral Actinolite is indicated Ca?(Mg Fe)5(Si)8(O)22(OH)2, a Calcium Magnesium Iron Silicate Hydroxide. Actinolite is actually a Silicate mineral. The name of the mineral species Actinolite is derived from a Greek word Aktinos, which means ray. This is relative to the fibrous nature of the mineral Actinolite, which is commonly exhibiting a nice and interesting microscope appearance when viewed under polarized microscopes used in optical mineralogy. Another variety of Actinolite is called Nephrite. This variety is of great abundance but shows very few color varieties when examined under a petrographic polarizing microscope used in optical mineralogy. Colors vary only from creamy white to green, which is often very interesting when viewed with the aid of polarizing light microscopes used in optical mineralogy.

 

            Mineral Actinolite is known to crystallize in the monoclinic system, which is commonly seen clearly visible when the mineral is viewed under petrographic polarizing light microscope for mineralogists and most often found with typical prismatic habit.  In 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. They also appear as freely grown crystals, which are flattened and elongated and are most commonly found exhibiting a nice and fascinating appearance under polarizing microscopes for mineralogists. A dome-like termination is also found visible when the mineral specimen is evaluated in polarized light microscope used in optical mineralogy and oftentimes it is found with an appearance of two of the four faces of a prism. Upon viewing the mineral under petrographic polarizing microscopes used in optical mineralogy, several crystal habits can be clearly exhibited by the mineral. Some are bladed which appear to be aggregates of thin lath-like crystals that are usually very interesting when viewed with the aid of petrographic polarizing microscopes used in optical mineralogy. Others are known to be fibrous or showing crystal of fibers that are radial where crystal radiates from a center without stellar formation produced. This habit usually produces nice and fascinating images under polarizing microscopes for mineralogists.

 

            Actinolite shows a variety of color when it is viewed with the aid of a petrographic polarizing microscope used in the field of optical mineralogy. They usually appear in green, white or gray colors, which are often found splendidly exhibited under polarized microscopes used in optical mineralogy. Sometimes light brown and dark green that can produce amazing microscope image presentation when evaluated with the aid of polarizing light microscopes used in optical mineralogy. The green color is actually a reflection of the high iron content of the mineral. As the iron content increases, the mineral color darkens from green to black that can be seen clearly visible under polarizing microscopes for mineralogists. The cleavage found when the mineral is evaluated under petrographic polarizing light microscope used in the field of optical mineralogy usually appears to be perfect in two directions that are positioned at close to 60 degree angle and 120 degree angle. When the mineral is evaluated under several adjustments on the aperture diaphragm of polarized microscope used in optical mineralogy, the fracture exhibited is commonly splintery to uneven. Some elongated fractures may be produced upon intersections of partings and good cleavages are also visible thru several adjustments of petrographic polarizing microscopes used in the field of optical mineralogy. When the Actinolite mineral specimen is rubbed on a white porcelain streak plate, the streak produced by the mineral is commonly white. The hardness measure of the mineral using the Mohs scale method is usually ranging from 5.5 to 6 showing 5.7 at an average. The specific gravity measure of the mineral usually gives an approximate value ranging from 2.9 grams per cubic centimeters to 3.3 grams per cubic centimeters, which is considered slightly above average for translucent minerals.

 

Actinolite mineral is known having a biaxial negative figure with very large axial angle when viewed between crossed nicols of petrographic polarizing light microscope for mineralogists. Mineral Actinolite also often shows weak dispersion when evaluated in plane-polarized light of polarizing microscopes used in optical mineralogy. Also, a faint pleochroism can be found clearly visible when the mineral Actinolite is viewed under petrographic polarizing microscope used in the field of optical mineralogy. The formation of Actinolite mineral is mostly common in many igneous rocks that are under fairly low-temperature and high-pressure condition. They also appear in great abundance in regionally, metamorphosed rocks like schists. The mineral Actinolite is a common constituent of metamorphic rocks. Some Actinolite appears to be byssolite, which are microscopically fibrous crystal that are commonly very interesting to view under petrographic polarizing microscope used in optical mineralogy.



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Saturday, November 28th, 2009 at 10:15 am
Category:
The Silicates Mineral Class
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