COL  ICSD Collection Code 38526
 DATE Recorded Aug 12, 1986; updated Aug 12, 1986
 NAME Aluminium closo-20-oxotetrahydroxooctasilicate
 MINR Montmorillonite - from Unterrupsroth, Rhoen
 FORM Al4 Si8 (O H)4 O20
      = H4 Al4 O24 Si8
 TITL On the lattice shrinkage and structure of montmorillonite
 REF  Zeitschrift fuer Kristallographie, Kristallgeometrie, 
      Kristallphysik, Kristallchemie (-144,1977)
      ZEKGA 93 (1936) 481-487
 AUT  Nagelschmidt G
 TEST No R value given in the paper. (Code 51)
 TEST Coordinates or space group or lattice parameters are not 
      determined. (Code 71)