- Londonite, Tourmaline
- Small Cabinet, 5.5 x 2.8 x 1.8 cm
- Antsongombato gem mine, FKT Antsentsindrano, Andrembesoa Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar
A gemmy and lustrous, 1.6 cm, yellowish-green londonite crystal on matrix from Madagascar. Londonite is the ultra-rare, cesium-dominant analogue of rhodizite. This is a relatively large, unusually gemmy and pristine crystal. Most londonites have some damage. There are several red tourmaline crystals in the matrix.