Grandidierite — specimen 0744, photo © NMNHS

Grandidierite — specimen 0744

Origin

East Africa

Madagascar, Toliara, Anosy, Tranomaro

Grandidierite — specimen 0744, locality map

Data

Weight: 0.20 ct; size: 4.63 | 3.33 | 1.85 mm; shape: oval; colour: medium light very strongly bluish green; slightly greyish; clarity: slightly included; cut: fair; treatment: none.

Notes

Slightly included specimen; mixed style cut.

More information from ‘Classification’

Grandidierite

A rare accessory mineral in aluminous boron-rich rocks, regionally metamorphosed under low pressure; in pegmatites, gneisses; in xenoliths (Anthony et al., 2001—2005).