Citation: Sarp, H.; Cerny, R. (2004). Calcio-andyrobertsite-2O, KCaCu5(AsO4)4[AsO2(OH)2]*2H2O: its description, crystal structure and relation with calcio-andyrobertsite-1M Note: polytype 2O. European Journal of Mineralogy, 16, pp. 163-169.
Formula: As5 Ca Cu5 H6 K O22
List type: interleaving
List: 2D
Basis: (0;1;0 0;0;1)
Dimensionality: 2
Formula: As10 Cu10 O40 (As Cu O4)
Multiplicity: 1