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The green variety of grossular, named tsavorite after its discovery near the Tsavo National Park, is colored by a trace of vanadium. Most of this material is found in ¡°bombs,¡± crystals frozen in the host rock, with the transparent rough found in the cores. The color of tsavorite ranges from pale to intense dark green. Also occurring here is grossular in other colors, ranging from colorless and pale green to yellow, orange, and brown. Tanzania (table 4) is truly a treasure chest with respect to the sheer number of beautiful gemstones that the country produces. First notable for its tanzanites in the late 1960s, Tanzania next produced tsavorites, then Umba Valley sapphires, all in the northern part of the country. Most recently, the alluvial gem gravels of the Songea and Tunduru regions in the south have been productive. |
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