| 11. | The ?-polymorph consists of black hexagonal crystals, which turn dark green when exposed to air.
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| 12. | The species Cs 2 O forms yellow-orange hexagonal crystals.
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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. | It crystallizes in the hexagonal crystal system typically occurring as radiating acicular prisms and massive encrustations.
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| 15. | They form when beams kf0qunlight pass though hexagonal crystals of ice that are in cirrus clouds.
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| 16. | But not all hexagonal crystals are trigonal .)
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| 17. | It has a hexagonal crystal structure, with layers probably stacked in the sequence AcBiAbCjA . ..
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| 18. | It is not known whether Quaoar's ice consists of hexagonal crystals or an alternative cubic structure.
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| 19. | Trigonal, tetragonal and hexagonal crystals have a single optic axis, parallel to the c crystal axis.
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| 20. | It crystallizes in the hexagonal crystal system and has been found as primary euhedral di-rhombohedral, pseudo-octahedral crystals.
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