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The chemical formula of the mineral Hilairite is indicated by Na2Zr(SiO3)3 – 3H2O or Hydrated Sodium Zirconium Silicate. Hilairite is actually a Silicate mineral. The first mineral specimen of Hilairite was discovered from the Poudrette Quarry in Mont Saint-Hilaire in Quebec, Canada in 1974. Mineral Hilairite is known to crystallize in the trigonal system. Most Hilairite crystals are found transparent to translucent and opaque in appearance. The crystal habits of Hilairite usually include small prismatic crystals with rhombhohedral terminations as described in optical mineralogy field after evaluating with the aid of petrographic polarizing light microscope. Twinning is commonly found when Hilairite crystals are evaluated under polarizing microscopes used in optical mineralogy. The crystals are also commonly found doubly terminated when viewed in plane light of polarized light microscopes. 

 

Hilairite is commonly used as mineral specimen and is most often found exhibiting nice and fascinating microscope appearance when viewed under petrographic polarizing light microscope. Crystals of mineral Hilairite are usually found small in size but are generally well formed as described in optical mineralogy. These Hilairite mineral crystals are also most commonly found having interesting brown color and good luster when evaluated in reflected light of polarizing light microscopes used in optical mineralogy. When Hilairite specimen is found, it is usually considered as one of the great mineral collections because of its rarity and beauty when viewed under polarizing microscopes as well as it ties to the wonderful site of Mont Saint-Hilaire.

 

            Mineral Hilairite is most commonly found exhibiting nice and fascinating appearance when viewed with the aid of polarized microscopes. Hilairite is most commonly found having bronze yellow or dark brown to pink color and usually exhibits splendid appearance when viewed closely with the aid of petrographic polarizing microscope. Hilairite is most commonly found exhibiting a vitreous to waxy luster when viewed in reflected light of polarizing microscope for mineralogists. Cleavage planes are usually not observed even when the mineral is examined under several adjustments on the aperture diaphragm of the polarizing microscopes. Hilairite is usually found exhibiting a conchoidal fracture when examined closely under geological polarizing microscope. The hardness measure of the mineral when it is evaluated using the Mohs scale method is commonly found 4 or better. The specific gravity measure of the mineral is commonly found ranging from 2.72 grams per cubic centimeter to 2.74 grams per cubic centimeter, which is considered average. When the specimen of Hilairite is rubbed on a white porcelain streak plate, it is commonly found leaving a white streak.

 

            When mineral Hilairite is evaluated between crossed nicols of petrographic polarizing microscope, it is commonly found having uniaxial negative figure. The refractive index of Hilairite as described in optical mineralogy field is commonly found ranging from 1.596 to 1.609. The maximum birefringence exhibited by the mineral in plane-polarized light of geological polarizing microscopes is commonly 0.013. Mineral Hilairite also exhibits moderate surface relief under polarizing microscopes used in optical mineralogy. There is no specific data found on the toxicity and health dangers for mineral Hilairite. However, the specimens of this mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Hilairite is also a non-radioactive mineral species.

 

            Hilairite mineral is most commonly associated with other interesting minerals including gaidonnayite, aegirine, mangan-neptunite, ancylite, nenadkevichite, eudialyte, quartz, fluorite, microcline, albite, natrolite, calcite, analcime, pyrite, zircon, galena, epididymite, sphalerite, goethite and many more. Mineral Hilairite is only one of those many new interesting minerals that come from the famous mineral locality at Mont Saint-Hilaire in Quebec, Canada. The best field indicators of Hilairite usually include locality, crystal habit, luster and color.



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Tuesday, July 29th, 2008 at 7:30 am
Category:
The Silicates Mineral Class
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