AM_Pharmacolite
Formula: Ca As O6 H5
Name: Pharmacolite
Unit cell: 5.9745 15.434 6.2797 90.0 114.83 90.0 , V=525.52
Space group: I1A1 (9)

Ferraris G , Jones D W , Yerkess J , Acta Crystallographica, Section B , 27 (1971) p.349-354, Determination of hydrogen atom positions in the crystal structure of, pharmacolite, CaHAsO4(H2O)2, by neutron diffraction, Locality: Andreasberg, Harz Mts, Lower Saxony, Germany