Citation: Ribbe, P. H. (1979). The structure of a strained intermediate microcline in cryptoperthitic association with twinned plagioclase feldspar. American Mineralogist, 64, pp. 402-408.
Formula: Al K O8 Si3
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al16 O32 Si16 (Al O2 Si)
Multiplicity: 1
Coordination sequences: