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The chemical composition of mineral Earlshannonite is indicated by the formula (Mn,Fe++)Fe+++2(PO4)2(OH)2•4(H2O). Earlshannonite is considered as a very late-stage secondary mineral in a lithium-rich granite pegmatite. This mineral is usually found forming at Foote Quarry, Kings Mountain, Cleveland County, North Carolina, USA. Earlshannonite was named for Earl V. Shannon (1895-1981), American mineralogist and chemist, U. S. National Museum, Washington, D.C., USA. Mineral Earlshannonite is known to crystallize in the monoclinic system of crystal formation. Mineral Earlshannonite is commonly found colored yellow or reddish brown in color which can be more fascinating when viewed closely under polarizing light microscopes. It is commonly found showing good cleavage in two directions which can be found more clearly visible when viewed with the aid of petrographic polarizing microscopes. Earlshannonite is commonly found showing specific gravity measure of 2.9 grams per cubic centimeters. Most crystals of mineral Earlshannonite are found transparent to translucent in appearance. The fracture that is commonly found exhibited by Earlshannonite is usually found even showing flat surfaces, not the cleavage, that is fractured in an even pattern. This is more clearly exhibited by mineral under polarized microscopes. The crystal habit of mineral Earlshannonite is commonly found prismatic in form showing crystals shaped like slender prisms. It can be also found radial showing crystals radiating from center without producing stellar forms. All of which can be found more clearly exhibited when viewed closely under polarizing microscopes. Earlshannonite is usually found showing hardness ranging from 3 to 4 which can be measures using the Mohs scale method. It is also commonly found showing light brown streak when rubbed on white porcelain streak plate. Mineral Earlshannonite is also usually found showing vitreous to glassy luster when evaluated under polarizing microscopes for mineralogists. Earlshannonite is also commonly found showing biaxial negative figure when evaluated with the aid of polarizing microscopes. Mineral Earlshannonite is commonly found showing 0.0690 birefringence. Earlshannonite is usually found exhibiting light yellow to yellow brown pleochroism when viewed between crossed nicols of petrographic polarizing microscopes. Earlshannonite is a non-radioactive mineral as evaluated.



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Monday, January 31st, 2011 at 7:48 am
Category:
Optical Mineralogy
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