AM_Holtedahlite
Formula: Mg12 P5.76 C.24 O29.76 H6.76
Name: Holtedahlite
Unit cell: 11.203 11.203 4.977 90.0 90.0 120.0 , V=540.96
Space group: P31M (157)

Romming C , Raade G , Mineralogy and Petrology , 40 (1989) p.91-100, The crystal structure of natural and synthetic holtedahlite, Locality: Tingelstadtjern serpentine-magnesium deposit, Modum, Norway