AM_Ternesite Formula: Ca5 Si2 S O12 Name: Ternesite Unit cell: 6.863 15.387 10.181 90.0 90.0 90.0 , V=1075.12 Space group: PNMA (62)

Irran E , Tillmanns E , Hentschel G , Mineralogy and Petrology , 60 (1997) p.121-132, Ternesite, Ca5(SiO4)2SO4, a new mineral from the Ettringer Bellerberg/Eifel, Germany, Locality: Ettringer Bellerberg volcano, Eifel, Germany