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The chemical composiion of mineral Calkinsite-(Ce) is indicated by the formula (Ce,La)2(CO3)3•4(H2O). Calkinsite-(Ce) is a weathering product closely associated with burbankite. It is commonly found at Vermiculite prospects at the head of Big Sandy Creek, Rocky Boy’s Indian Reservation, about 40 km east of Box Elder, Hill Co., Montana, USA. Mineral Calkinsite-(Ce) was named for Frank Cathcart Calkins (1878-1974), geologist with the U.S. Geological Survey. Calkinsite-(Ce) is known to crystallize in the orthorhombic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Calkinsite-(Ce) is commonly found with perfect cleavage in one direction and distinct in one other direction. Calkinsite-(Ce) is usually found colored light yellow in hand sample. The density measure of mineral Calkinsite-(Ce) is usually found ranging from 3.27 to 3.29 grams per cubic centimeters, with an average of 3.28. Mineral Calkinsite-(Ce) is commonly found showing a hardness measure of 2.5 when evaluated using the Mohs scale method. Mineral Calkinsite-(Ce) is usually found showing biaxial negative figure when viewed between crossed nicols of polarized light microscopes for mineralogy. It is also showing 0.1170 birefringence. Calkinsite-(Ce) is commonly showing weak radioactivity after chemical evaluation.



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Friday, April 29th, 2011 at 7:14 am
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Optical Mineralogy
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