Answer the questions in order please. Following is a model (image pasted from Sm

Question

Answer the questions in order please.

Following is a model (image pasted from Smorf program) of a crystal made up of two set of faces (called forms) - triangular and rectangular faces. If you need to, you can make this model in Smorf yourself using the data shown in the image below. a) The face notation, Miller indices (hkl), of the triangular form/faces in this crystal is (_____) and that of the rectangular faces is (_____). b) This model belongs to the _____ crystal system, because _____ c) The total number of faces in this crystal model are _____ d) The total number of edges in the crystal is _____, Corners/vertices) present is _____ and the number of faces present are _____. e) The main rotation symmetry present symmetry along the c-axis) is _____. Does this crystal have a 4-fold rotation present? _____ (yes/No). If yes, where is it? _____. If no, why not? _____. f) Plot the crystal faces on the stereograph below.

Explanation / Answer

a)traingula faces has miller indice 111 and 110

b) Rhombic bipyramid, becuase meeting a common point

c) 12 faces

d) 16 edges, corner /vertices 10 and faces 12

e) open , yes four fold symmetry

f

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