Grandidierite
Grandidierite
Grandidierite

Grandidierite

€25,00

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SKU: B064
Behara, Amboasary South District, Anosy, Madagascar
The grandidierite crystals on this thumbnail specimen are beautifully arranged, but largely covered with residual matrix.
2.5 x 1.8 x 1.2 cm
5.9 g

Grandidierite is a rare orthohombic nesosilicate that consists of both SiO4 and BO3 elements ("borosilicate"). The blue-green mineral is relatively hard (Mohs=7.5), mostly opaque, more rarely translucent or transparent. A higher iron content causes grandidierite to be greener in color. Crystals with terminal faces are rarely found.