Green chalcedony which is quartz containing nickel which gives the green color
Cabochons Chrysoprase Gemstone
Candala Chrysoprase
Luminous Chrysopal Rough Piece
"Chrysopal" has been used as a sort of synonym for either Olivine, Chrysoberyl or Opal according to mindat.org. Opal is a hydrated amorphous form of silica ; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%.
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