ghutchis

  int numcartpershell[14] = {1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 93, 107}; 

  const char* map[14] = {"S\0", "P\0", "D\0", "F\0", "G\0", "H\0",
                  "I\0", "K\0", "L\0", "M\0", "N\0", "O\0", "Q\0", "R\0"};

ghutchis

crown ethers
cryptands
pyridines
edta
eta2-ethylene
eta2-acetylene
eta4-c4
eta3-c3
eta3-allyl
eta7-c7

ghutchis

http://cst-www.nrl.navy.mil/lattice/
http://en.wikipedia.org/wiki/Category:Minerals_by_crystal_system

http://www.crystallography.net/
http://wwmm.ch.cam.ac.uk/crystaleye/
Zeolites: http://www.iza-structure.org/databases/

AlO
  γ-, δ-, η-, θ-, and χ-aluminas