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Tanzania | |
| (2002) Emeralds of the World. extraLapis English 2. Lapis International LLC |
| [var. Chalcedony] Natural History Museum Vienna collection (labeled as "chrysoprase", but is only very pale greenish to almost colourless) |
| Mineralogical Magazine, Vol. 66, N. 2, 1st April 2002, pp. 287-299. |
| [var. Smoky Quartz] Werner Radl collection |
| Mr. Jochen O. Hintze |
| Mattsson, H. B., & Reusser, E. (2010). Mineralogical and geochemical characterization of ashes from an early phase of the explosive September 2007 eruption of Oldoinyo Lengai (Tanzania). Journal of African Earth Sciences, 58(5), 752-763. |
Arusha Region, Tanzania