As always, opals vary in color a lot.
[INORGANIC:OPAL_REDFLASH]
[USE_MATERIAL_TEMPLATE:STONE_TEMPLATE]
[TILE:15][IS_GEM:red flash opal:STP:OVERWRITE_SOLID][DISPLAY_COLOR:4:7:1][MATERIAL_VALUE:20]
[ENVIRONMENT:ALL_STONE:CLUSTER_SMALL:8]
[SOLID_DENSITY:2115] Common to opals. Range is 1980 - 2250
[STATE_COLOR:ALL_SOLID:RED]