AM_Apophyllite-(KF)_1
Formula: K Ca4 Si8 O28 F H16
Name: Apophyllite-(KF)
Unit cell: 8.965 8.965 15.767 90.0 90.0 90.0 , V=1267.21
Space group: P4/MNC (128)

Chao G Y , American Mineralogist , 56 (1971) p.1234-1242, The refinement of the crystal structure of apophyllite II. Determination of the, hydrogen positions by X-ray diffraction, Note: O1-B23 changed to match symmetry constraints