| 21. | It crystallizes in the tetragonal crystal system.
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| 22. | Each vertex is surrounded by 4 truncated tetrahedral cells in a tetragonal disphenoid vertex figure.
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| 23. | If between . 71 and . 9, the crystal will be orthorhombic or tetragonal.
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| 24. | Two are in approximate tetragonal pyramids and the third is essentially a trigonal bipyramidal coordination.
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| 25. | Between 0.7 and 1.1 GPa the clathrate has a tetragonal structure.
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| 26. | It crystallizes in the tetragonal system and occurs both in good crystals and as formless masses.
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| 27. | The tetragonal form is called litharge.
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| 28. | More complicated aggregations have also been observed, such as rhombohedral, tetragonal and orthorhombic phases.
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| 29. | The mineral is classified under the space group P4 1 2 1 2 and is tetragonal.
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| 30. | Well known crystalline forms are ?-rhombohedral, ?-rhombohedral, and ?-tetragonal.
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