Although anyolite is advertised as a variety of the mineral zoisite from Kenya and the Arusha Region of Tanzania, anyolite is actually a metamorphic rock composed of intergrown green zoisite, black/dark green pargasite (erroneously identified as tschermakite), and ruby. The term anyolite is however not an officially accepted term for a metamorphic rock. It is said to be named after the Maasai word anyoli, meaning "green." Anyolite is also referred to as ruby in zoisite or Tanganyika artstone.
In 2010 it was suggested that a 2 kilogram stone known as the Gem of Tanzania owned by the defunct company Wrekin Construction and fraudulently valued at £11 million was actually a lump of Anyolite worth about £100, although it was eventually sold for £8000. It is reported that the stone originally came from a mine near Arusha, Tanzania
- http://www.mindat.org/min-27151.html Mindat
- http://www.cst.cmich.edu/users/dietr1rv/zoisite.htm Gemrocks
- Metamorphic rocks, A classification and glossary of terms, D. Fettes and J. Desmons ed., Cambridge University Press
- Jonathan Guthrie (October 1, 2009). "Now £11m Gem of Tanzania hits rock bottom". Financial Times.
- "Wrekin's '£11m' Gem of Tanzania ruby sold for £8k". BBC News. 16 February 2010.
- Guthrie, Jonathan; Pearson, Samantha (27 March 2019). "The strange journey of the 'jinxed' jewel". Financial Times. Retrieved 18 September 2019.
- Jonathan Guthrie (December 17, 2009). "Ruby rises from rock bottom". Financial Times. Archived from the original on January 28, 2010. Retrieved 2010-01-17.
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