Packing Fraction

3D Close Packing || Formation OF Triangular void after Placing First (A) Layer || Formation OF Tv and Ov after Placing Second (B) Layer, ABAB.... || type OF Packing - HCP (Z,CN) || Packing Fraction OF Unit Cell || Volume OF Atoms and unit Cell

If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesiums ions, m and n respectively, are

AgI crystallises in a cubic close-packed ZnS structure. What fraction of tetrahedral sites is occupied by Ag^(+) ions ?

A two dimensional lattice of closest packed identical circles , indicating a suitable unit cell is represent as follows then the fractional void area is

In a hexagonal close packed (hcp) structure of spheres, the fraction of the volume occupied by the sphere is A. In a cubic close packed structure the fraction is B. The relation for A and B is: