| 1 | The point groups of octagonal system in quasicrystal are studied. | |
| 2 | An element of the material at such a point behaves like a crystal of the orthorhombic system. | |
| 3 | In their most basic form, snow crystals are hexagonal prisms like the sample, above, but other, more complex forms are famously possible. | |
| 4 | A method of obtaining the pure mode direction of the trigonal system by the slowness surfaces is introduced. | |
| 5 | The selected area electron diffraction (SAED) pattern of the twin was indexed by transforming matrix of hexagon crystal twin plan. |
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