Hambergite, named after Axel Hamberg, the Swedish mineralogist, occurs as colourless to yellowish white crystals, but is rarely gem-quality. Brittle, with perfect cleavage, it's very fragile and suitable just for collectors. When cut, it appears like glass, but double images of the rear facets might be seen with the table facet because of its high birefringence.
Gem quality hambergite can be found in Kashmir (India), as well as in Madagascar.
