|Color||Green with ruby inclusions and black spots|
|Mohs scale hardness||6-7|
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, ruby zoisite, ruby-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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