Citation: Pagoaga, M. K.; Appleman, D. E.; Stewart, J. M. (1987). Crystal structures and crystal chemistry of the uranyl oxide hydrates becquerelite, billietite, and protasite. American Mineralogist, 72, pp. 1230-1238.
Formula: Ca O30 U6
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: O44 U12 (O11 U3)
Multiplicity: 1