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chrome chalcedony
Chrome chalcedony is a green variety of the mineral chalcedony, colored by small quantities of chromium.
It is most commonly found in Zimbabwe, where it is known as Mtorolite, Mtorodite, or Matorolite.
==Chemical composition==
Chrome chalcedony is similar in appearance to the better known chrysoprase, but differs in that whilst chrome chalcedony is colored by chromium (as chromium(III) oxide), chrysoprase is colored by nickel.〔 The two can be distinguished with a Chelsea color filter, as chrome chalcedony will appear red, whilst chrysoprase will appear green.〔 Chrome chalcedony (unlike chrysoprase) may also contain tiny black specks of chromite.〔
Chrome chalcedony is (together with agate, carnelian, chrysoprase, heliotrope, onyx and others) a variety of chalcedony. This is a cryptocrystalline form of silica, consisting of fine intergrowths of the minerals quartz and moganite.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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