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The chemical formula of mineral Liroconite is indicated by Cu2Al(AsO4)(OH)4 – 4H2O or Hydrated Copper Aluminum Arsenate Hydroxide. Liroconite is actually a Phosphate mineral. Mineral Liroconite was first discovered in 1825 at the Wheal Gorland Mine of Cornwall, England. The name of the mineral was derived from the Greek words liros, which means pale and konia, which means powder. Liroconite is known to crystallize in the monoclinic system of crystal foramtion. 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.

 

Liroconite is only used as mineral specimen and it is often found exhibiting interesting appearance when viewed with the aid of polarizing light microscopes used in optical mineralogy. Mineral Liroconite is very beautiful most especially when viewed under petrographic polarizing light microscope. But then, this mineral species is not often found available from any new source. Collectors are only and almost relying completely on old collections to supply this mineral species. Liroconite is a truly beautiful mineral that commonly displays typical bright blue color that can be more majestically exhibited when viewed with the aid of polarizing light microscopes for mineralogists. Liroconite also exhibits a nice glassy luster and an interesting crystal habit that is more wonderfully exhibited when evaluated with the aid of polarized light microscopes.

 

            Liroconite is most commonly found exhibiting a typical blue to bluish green color that is more fascinatingly beautiful when viewed with the aid of petrographic polarizing light microscope used in optical mineralogy. Liroconite is also most commonly found vitreous luster when viewed in reflected light of the polarizing microscope. Liroconite is also most commonly found showing poor cleavage in two directions parallel to the prism faces that can be made more clearly visible when viewed with the aid of petrographic polarizing light microscopes. Liroconite is also found having uneven fracture when viewed under polarizing microscope used in optical mineralogy. The specific gravity measure of the mineral usually gives an approximate value ranging from 2.95 grams per cubic centimeters to 3.0 grams per cubic centimeters, which is considered average for translucent minerals. The hardness measure of Liroconite when it is evaluated using the Mohs scale method is usually found ranging from 2 to 2.5. Liroconite is commonly found leaving a pale blue streak when specimen is rubbed on the white porcelain streak plate.

 

            Most crystals of mineral Liroconite are found transparent to translucent in appearance. The crystal habit of mineral Liroconite as described in optical mineralogy usually includes crusts with wedge to lens shaped crystals that can be seen more clearly visible and interesting when viewed with the aid of polarizing microscope for mineralogists. Individual crystals of mineral Liroconite can appear as if part of the more symmetrical eight faced tetragonal bipyramid when viewed under polarizing light microscope. But then these are actually composed of the four faces of two monoclinic domes and the faces of a four-faced prism.

 

            Liroconite has no dispersion display and it usually exhibits a moderate surface relief when evaluated under several adjustments on the aperture diaphragm of the petrographic polarizing light microscopes. Mineral Liroconite is most commonly found showing biaxial negative figure when evaluated between crossed nicols of the polarizing light microscopes used in optical mineralogy. The refractive index of mineral Liroconite is most commonly found ranging from 1.612 to 1.675 when viewed in plane polarized light of polarizing microscopes for mineralogists. The maximum birefringence exhibited by mineral Liroconite when it is evaluated between crossed polars of polarized microscope is usually 0.063. Mineral Liroconite has no reaction to acid like mineral azurite. There is no specific data found on the toxicity and health dangers for mineral Liroconite. However, the specimens of this mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Liroconite is a non-radioactive mineral species.

 

            Liroconite is most commonly found associated with other interesting minerals like clinoclase, malachite, linarite, azurite, and caledonite and also other oxidation zone copper ore minerals. Mineral Liroconite forms from the oxidation of primary copper ores. The fine crystals of mineral Liroconite were mined from the famous mines of Cornwall and Devon of England. This is the only site known producing significant Liroconite specimens. But nowadays, this site is already dried up although some of the old dumps have produced some specimens. Liroconite can be only found as traces in some other locations. It can be also found in Russia, Germany, and at the Cerro Gordo Mine, Inyo Co., California, USA. It can be also found occasionally elsewhere.



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Thursday, November 27th, 2008 at 3:44 am
Category:
The Phosphates Mineral Class
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