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Crystal structure                               1         2         3          4
                                                                                     4











                    Hexagonal                                 Hexagonal close-packed (HCP)



             close-packed                                     with the top and bottom faces of the

                                                              unit cell consist of six atoms that


                                                              form regular hexagons and surround


                                                              a single atom in the center.
























                                                                                                                                        137
                                                                                         Source: Jr., W. D. C. & Rethwisch, D. G. 2015

                                                    Politeknik Ibrahim Sultan
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