Key
to mineral data bar 

ex.
Antifluorite 

tetra 
100% 
fcc 
3d 
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 
3d  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 
