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In order to characterize the role of Ti in the crystal structure of calcium amphiboles with high or even dominant oxo-component, the crystal structure of a Ti-rich calcium amphibole from a gabbro at Kaersut, Greenland, has been refined with single-crystal MoKα X-ray intensity data to an R1(F) index of ~0.025, and with single-crystal Laue neutron intensity data to an R1(F) index of ~0.053. The crystal...
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