Cyclops (rock)
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A Mexican agate, showing only a single eye, has received the name of cyclops. Included matter of a green colour, like fragments of "green earth," embedded in the chalcedony and disposed in filaments and other forms suggestive of vegetable growth, gives rise to moss agate.
Reference
- THE NOMENCLATURE OF SILICA by GILBERT HART, American Mineralogist, Volume 12, pages 383-395, 1927 (http://www.minsocam.org/MSA/collectors_corner/arc/silicanom.htm)