TZZ54CD6: Grandidierite crystal of considerable size for the species, of a very uniform and deep bluish green color, and accompanied in the base of the crystal by a pseudomorph, possibly after Tourmaline, replaced by minerals whose species could not be clearly identified, beyond being a mixture of silica gel with remnants of Opal.
Mineralogy never ceases to surprise us, and certainly the pegmatites of Madagascar do not stop surprising us.
Tranomaro-Maromby area, Amboasary District, Anosy Region (Fort Dauphin Region), Toliara Province (Tuléar)  Madagascar

Specimen size: 4.1 × 3.4 × 1.2 cm = 1.61” × 1.34” × 0.47”

Main crystal size: 4.1 × 3.1 cm = 1.61” × 1.22”