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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of mineral Brockite is inidcated by (Ca,Th,Ce)(PO4)•(H2O). mineral Brockite is cconsidered as a rare accessory mineral in granite and granite pegmatites. It is commonly found at its type of locality in the USA, in a prospect pit about one km east of the Bassick mine, Querida, Wet Mountains, and at the Hardwick mine and Nightingale shaft, Custer Co., Colorado. This mineral was named to honor Maurice R. Brock, U.S. Geological Survey, who supplied the first specimen. Mineral Brockite is known tto crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Brockite has no cleavage display even when evaluated closely with the aid of polarizing microscope used in the field of optical mineralogy. Brockite is commonly found colored white, light yellow, dark reddish brown, or reddish brown color in hand sample. Mineral Brockite is also found to have specificgravity measure ranging from 3.7 to 4.1 grams per cubic centimeters, giving an average of average of 3.9. Most crystals of mineral Brockite are found translucent in appearance. Brockite is commonly found showing conchoidal fractures developed in brittle materials characterized by smoothly curving surfaces like that of quartz. Mineral Brockite is commonly found showing a hardness measure ranging from 3 to 4. It is also commonly found showing vitreous to greasy luster when viewed in reflected light of petrographic polarizing microscopes. Brockite is also commonly found exhibiting uniaxial positive figure when evaluated between crossed nicols of polarized microscope used in optical mineralogy. It is also usually found showing 0.0150 birefringence. It is also commonly found to be strongly radioactive.



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Tuesday, March 29th, 2011 at 5:37 am
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Optical Mineralogy
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