From Dwarf Fortress Wiki
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Chrysoprases are unremarkable low-value gems found in sedimentary layers.
 In Real Life
Chrysoprase is the proper name for a green chalcedony, also known as Australian jade. It's relatively rare.
[INORGANIC:CHRYSOPRASE] [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE] [MATERIAL_VALUE:2][DISPLAY_COLOR:2:7:1][TILE:15][IS_GEM:chrysoprase:STP:OVERWRITE_SOLID] [ENVIRONMENT:SEDIMENTARY:CLUSTER_SMALL:100] [SOLID_DENSITY:2650] Common to quartz gems [STATE_COLOR:ALL_SOLID:JADE]