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An apple-green variety of chalcedony. The colour is caused by tiny inclusions of Ni-bearing layers silicates (willemseite, népouite or others).
Compare also mtorodite.
Visit gemdat.org for gemological information about Chrysoprase. Currently in public beta-test.
Classification of Chrysoprase
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Other Names for Chrysoprase
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References for Chrysoprase
G. Skrzypek, M. Sachanbiński, M.O. Jędrysek (2003): Oxygen isotope evidence for low temperature formation of chrysoprase. Mineralogical Society of Poland - Special Papers, Vol. 22, p. xx.
Internet Links for Chrysoprase
Localities for Chrysoprase
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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New Locality Added: Cabeço do Tojal Mine, Samil, Bragança, Bragança District, PortugalFrom Rui Nunes, 18th Sep 2014 15:28:42