Tsavorite?or?tsavolite?is a variety of the?garnet?group species grossular, a calcium aluminium?garnet?.Trace amounts of vanadium or chromium provide the? natural green? radiant color.
Green grossular had been rare until 1967, when British gem prospector and geologist Campbell R. Bridges came across a deposit of the?mineral?in the mountains of north-east Tanzania. The specimens he found were of very intense color and of high transparency.