Is the rare deep green variety of Grossular Garnet

A variety of garnet that is transparent and emerald green in color.

transparent green garnet of the grossular family of garnets found at Tsavo, Kenya. Tsavorite is not the only green garnet, see also Uvarovite.

Tsavorite is a rare, deep green variety of grossular garnet, a type of garnet, calcium-aluminum silicate. The emerald green color comes from vanadium and chromium. Tsavorite is similar to emerald, but is rarer and more durable; it also has a higher refractive index, 1.74. Tsavorite stones over two carats are considered large and are very rare. Tsavorite has a hardness of 7.5 and a specific gravity of 3.6. Tsavorite is found in east Africa; it was named by Harry B. Platt of Tiffany & Co. for the Tsavo National Park in Kenya, where this gemstone was originally found in 1967. Tsavorite is not enhanced.

A transparent, emerald green variety of garnet.

Tsavorite or tsavolite is a member of the garnet family group grossular which is a calcium-aluminium garnet with the formula Ca3Al2Si3O12)Gemological Institute of America, GIA Gem Reference Guide 1995, ISBN:0-87311-019-6 Trace amounts of vanadium or chromium provide the green color.