Category Nesosilicate Dana classification 54.01.01.01 | Strunz classification 9.AJ.05 Crystal system Orthorhombic | |
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Formula
(repeating unit) (Mg,Fe)Al3(BO3)(SiO4)O2 Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) | ||
Grandidierite is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar.
References
Grandidierite Wikipedia(Text) CC BY-SA