自从1970年代发现这种玛瑙以来，许多学者已讨论过其成因，有几种推测和北落师门，Power-rdv兄所说的很相近： I've heard a couple of explanations for them. Crystals of another mineral formed first, creating the angular shapes. Those crystals were later dissolved, probably by caustic hydrothermal fluids. Agate was later deposited in the angular cavities left by the crystals. You says they were formed in spaces between calcite crystals resulting in the unusual shapes. I question that but have no proof.