| 11. | One form is rhombohedral and the other is hexagonal, the former having a disorder.
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| 12. | The geometry that the OSA finally chose is a rhombohedral lattice based on a cuboctahedron.
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| 13. | The Bravais lattices in the hexagonal crystal family can also be described by rhombohedral axes.
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| 14. | More complicated aggregations have also been observed, such as rhombohedral, tetragonal and orthorhombic phases.
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| 15. | The crystal system is a trigonal-rhombohedral class 3 and has space group of R.
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| 16. | Chabazite crystallizes in the triclinic crystal system with typically rhombohedral shaped crystals that are pseudo-cubic.
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| 17. | Under pressure scandium trifluoride also forms different crystal structures with rhombohedral, and above 3 GPa tetrahedral.
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| 18. | "' Eucryptite "'is a lithium bearing aluminium trigonal-rhombohedral crystal system.
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| 19. | Well known crystalline forms are ?-rhombohedral, ?-rhombohedral, and ?-tetragonal.
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| 20. | Well known crystalline forms are ?-rhombohedral, ?-rhombohedral, and ?-tetragonal.
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