a. A white or gray chalcedony, opal, or massive quartz unevenly colored by, or intergrown with, pink or reddish inclusions of cinnabar, the color of which tends to become brown. The opal variety is know as opalite.
b. Cinnabar intergrown with common white opal or translucent chalcedony.
Source: Dictionary of Mining, Mineral, and Related Terms











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