Posted on March 1, 2018 by Çigdem Lüle, PhD, FGA, GIA GG, DGA

Grandidierite has been a rare collector’s stone since its discovery in Tuléar Province, Madagascar at the end of the 19th century. It is a nesosilicate with a chemical formula of (Mg,Fe)Al3(BO4)(SiO4)O and crystalizes in the…

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