AM_Schorl_3 Formula: Ca.027 Na.54 K.025 Al6.639 Mg.636 Fe1.671 Ti.009 V.006 Mn.012 Zn.006 Si6 B3 O30.796 F.204 H3.396 Name: Schorl Unit cell: 15.946 15.946 7.157 90.0 90.0 120.0 , V=1576.03 Space group: R3M (160)

Bloodaxe E S , Hughes J M , Dyar M D , Grew E S , Guidotti C V , American Mineralogist , 84 (1999) p.922-928, Linking structure and chemistry in the schorl-dravite series, Sample HP2-1