Ertl A , Tillmanns E , Ntaflos T , Francis C , Giester G , Korner W , Hughes J M , Lengauer C , Prem M , European Journal of Mineralogy , 20 (2008) p.881-888, Tetrahedrally coordinated boron in Al-rich tourmaline and its relationship, to the pressure-temperature conditions of formation, Locality: Sahatany Pegmatite Field, Manjaka, Sahatany Valley, Madagascar, Note: O5 and O6 z-coordinates changed to match reported bond lengths