The pegmatitic rocks located in the south-east of Côte d'Ivoire between Comoé basin and Sefwi belt are subject this study. geology region consists gneisses, granites, microgranites, amphibolites, mylonites metasediments. All these generally crosscut by quartz pegmatite lodes. petrographic studies allow us to discriminate four groups pegmatites on basis mineralogy: (i) beryl-muscovite bearing (A...

Elbaite (space group R3m), a Li-bearing tounnaline with general fonnula of XY3Z"(B03hSi,,0,,W4, has 5 kinds of cations and 8 kinds 01'0 (including W). Of the structural studies of tourmaline, those of Gabrielle Donnay and hcr group were unique in focusing on the structural aspccts ofthc primary pyroelectricity (Donnay, 1977" etc). Donnay (1977) refined the structure of elbaite, and tound that t...