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The chemical formula of Prasiolite is indicated by SiO2 or Silicon Oxide. Prasiolite is actually the green variety of Quartz mineral. Prasiolite is the name applied to any quartz crystals or cluster that is green showing green color that commonly exhibits nice and interesting microscope images under polarizing microscope used in optical mineralogy. It is also sometimes called vermarine. Prasiolite is actually quite rare in nature despite the fact that it is often cut for gemstone purposes. Most Prasiolite specimens found on the market are actually heat treated amethyst. It has been found in optical mineralogy that when amethyst is heat treated, the amethyst crystal from most locations transforms into yellow or orange citrine that appears more fascinating when viewed with t aid of polarizing microscope for mineralogists. However, there can be instances wherein from a few locations, a green color results yielding Prasiolite which is often wrongly called as the green amethyst. These locations include Montezuma, Brazil, and Arizona. There is also reported occurrence of natural Prasiolite in Poland.

 

            Mineral Prasiolite is sometimes spelled as praziolite. This mineral is sometimes confused with the similarly colored praseolite, which results from the heat treatment of iolite, a variety of cordierite. It should be noted that praseolite is a cordierite variety, while Prasiolite is a quartz variety. Prasiolite is a macrocrystalline quartz. Crysoprase is actually green cryptocrystalline quartz, where the individual crystals are too small to be seen and the resulting transparency is translucent. The term prase is sometimes used for any leek-green color of quartz, whether macro or cryptocrystalline.

 

            Some colorless quartz crystals are found with sufficient inclusion of chlorite to result in a green color. However, these specimens would not be considered Prasiolite. In any event, the color is wrong because they more of a dark green than a leek green. Prasiolite is only one of the quartz varieties known in the mineral world. Other varieties that form macroscopic or large enough to see crystals are amethyst, citrine, milky quartz, rock crystal, rose quartz and smoky quartz.

 

            Prasiolite is most commonly used for gemstone and ornamental stone purposes. Prasiolite is usually found exhibiting nice and splendid microscope appearance when viewed under gemological microscope. As mentioned above, Prasiolite is most commonly found exhibiting pale lime green color that could appear more fascinating when viewed under petrographic polarizing microscope used in the field of optical mineralogy. Prasiolite is often found showing index of refraction ranging from 1.544 to 1.553 when specimen sample is evaluated using the petrographic polarizing microscope used in optical mineralogy. Prasiolite also shows 0.009 birefringence when viewed with the aid of polarized microscope for mineralogists. The hardness measure of the mineral Prasiolite when it is evaluated using the Mohs scale method is usually 7. It has no cleavage found even when specimen sample is closely examined using the polarizing microscopes for geologists. Prasiolite is also known to crystallize in the trigonal system of crystal formation.



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Monday, June 29th, 2009 at 2:35 pm
Category:
The Silicates Mineral Class
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