AM_Oxy-schorl Formula: Na.86 Ca.02 K.02 Al6.741 Fe1.23 Ti.111 Mg.978 Zn.009 B3 Si5.94 H3 O30.81 F.19 Name: Oxy-schorl Unit cell: 15.929 15.929 7.183 90.0 90.0 120.0 , V=1578.39 Space group: R3M (160)

Ertl A , Marschall H , Geister G , Henry D , Schertl H P , Ntaflos T , Luvizotto G , Nasdala L , Tillmanns E , American Mineralogist , 94 (2010) p.1-10, Metamorphic ultrahigh-pressure tourmaline: structure,, chemistry, and correlations to P-T conditions, Locality: Saxonian Erzegebirge, Germany