AM_Ca2SiO3OHF Formula: Ca2 Si O4 F H Name: Ca2SiO3OHF Unit cell: 5.8111 10.605 6.6968 90.0 102.025 90.0 , V=403.65 Space group: P121/C1 (14)

Leinenweber K , Johnson J , Groy T , American Mineralogist , 90 (2005) p.115-121, Ca2SiO3OHF - A high-pressure phase with dense, calcium polyhedral packing and tetrahedral silicon