| 1. | Columbite has the same composition and crystal symmetry ( orthorhombic ) as tantalite.
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| 2. | The Danish scientist Nicolas Steno ( 1669 ) pioneered experimental investigations of crystal symmetry.
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| 3. | However, note that some piezoelectric materials have a crystal symmetry that does not allow pyroelectricity.
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| 4. | The crystal symmetry is monoclinic C2 / c, No . 15, Pearson symbol mS48.
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| 5. | Its crystal symmetry was first assigned as orthorhombic, then as monoclinic, and finally as triclinic.
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| 6. | Those minerals have same chemical composition but different crystal symmetry : orthorhombic for columbite and tetragonal for tapiolite.
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| 7. | Those minerals have same chemical composition, but different crystal symmetry orthorhombic for tantalite and tetragonal for tapiolite.
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| 8. | Owing to the crystal symmetry, the tetrahedral coordination between these superstructure units is again a key factor.
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| 9. | Le Bail analysis provides a more reliable estimate for the intensities of allowed reflections for different crystal symmetries.
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| 10. | Wilhelm R�ntgen discovered X-rays in 1895, just as the studies of crystal symmetry were being concluded.
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