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The chemical formula of mineral Woodhouseite is indicated by CaAl3PO4SO4(OH)6 or Calcium Aluminum Phosphate Sulfate Hydroxide. Woodhouseite is actually a Sulfate but it is also sometimes classified as a Phosphate mineral. Woodhouseite is only used as mineral specimen. Woodhouseite is a rare mineral that is almost exclusively from a single location at Champion Andalusite Mine on the Western slopes of the White Mountain Peak in Mono County, California. Woodhouseite is usually found forming flesh-colored to colorless pseudocubic rhombohedrons. The crystals of Woodhouseite can look nearly cubic but the angles between the faces are not exactly 90 degrees as is required for a true cube. The wedge shaped and distorted crystals of mineral Woodhouseite are sometimes found when specimen is evaluated more closely under polarizing microscope used in optical mineralogy. The same is the true with the modified rhombohedrons. Faces of Woodhouseite crystals tend to be curved and striated and these can be seen more clearly visible when viewed with the aid of petrographic polarizing microscopes. Woodhouseite is usually found forming in quartz veins with topaz, andalusite, tourmaline and svanbergite, another rare phosphate-sulfate mineral. Woodhouseite is quite difficult to classify because it has both phosphate and sulfate anion group. The phosphate anion group of mineral Woodhouseite would normally classify the mineral under Phosphate minerals. However, the sulfate anion of mineral Woodhouseite is intricate and essential in its structure while the phosphate anions can be substituted for to at least a limited degree. Some other classification schemes may however place Woodhouseite in the Phosphate Class.        

 

            Mineral Woodhouseite is most commonly found flesh-colored, pink, pale orange to colorless when viewed with the aid of petrographic polarizing light microscopes used in optical mineralogy. It is also usually found showing vitreous luster when viewed in reflected light of petrographic polarizing light microscopes for mineralogists. Most specimens of mineral Woodhouseite are usually found translucent to small crystals being transparent. Woodhouseite is also known to crystallize in the trigonal system of crystal formation. The crystal habits of the mineral as described in the field of optical mineralogy usually include pseudocubic rhombohedrons and wedge-shaped crystal. Distorted and modified rhombohedrons are also seen clearly visible when viewed closely with the aid of polarizing microscope used in optical mineralogy. Faces of Woodhouseite crystals tend to be curved and striated.

 

            Mineral Woodhouseite is most commonly found showing perfect basal cleavage in one direction which can be found more clearly visible when viewed with the aid of polarized microscopes for mineralogists. The hardness measure of mineral Woodhouseite when it is evaluated using the Mohs scale method is usually 4.5. Woodhouseite is also most commonly found leaving a white streak when rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 3.0 grams per cubic centimeters, which is average for non-metallic minerals. Woodhouseite is usually found associated with other interesting minerals including quartz, tourmaline, topaz, svanbergite and andalusite. The best field indicators of mineral Woodhouseite usually include locality, color, striations and crystal habit. Woodhouseite has limited occurrence at the Champion Andalusite Mine on the Western slopes of the White Mountain Peak in Mono County, California.      

 



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Thursday, October 15th, 2009 at 4:22 am
Category:
The Phosphates Mineral Class
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