Key to mineral data bar
 
ex. Antifluorite
 

tetra

100%

fcc

3-d

6 edges

A- 4c, X- 8c/fcc

1

2

3

4

5

6
 
     1 -  Type of  void in the close packed X atoms that is occupied with A atoms
              tetra - tetrahedral voids
              octa - octahedral voids
              cube - cubic voids
              trigonal prism - voids
 
     2 -  % occupation of voids with A atoms (overall lattice structure unless indicated)
 
     3 -  Packing arrangement of close packed X atoms
              fcc - face centered cubic
              hcp - hexagonal close packed
              bcc - body centered cubic
              cp - simple cubic
              hp - simple hexagonal
 
     4 -  Gross description of crystal structure
              3-d -  coordination polyhedra linked together to fill all space
              layer - coordination polyhedra linked into discrete layers
              chain - coordination polyhedra linked into chains
              molecular - discrete coordination polyhedra
 
     5 -  Number and type of linking surfaces of coordination polyhedra
              vertices, faces, edges
 
     6 -  Coordination of A atoms and X atoms
              coordination of A atoms in terms of X atoms,  ex. A- 4c
              coordination of X atoms in terms of A atoms, ex. X - 8c
              a slash / indicates which atoms are close packed (A or X), ex. X- 8c/fcc