名词玉髓
calcedony的反义词
1. 玉髓：calcareous 钙质的 | calcedony 玉髓 | calciclase 钙长石
1. Agate is the banded form of Chalcedony (also spelt Calcedony, it is the catch all term for cryptocrystalline Quartz) and its name was derived from the site of its discovery, the river Achates in southwest Sicily.
玛瑙是一种纤维状玉髓晶体（英语也拼写为 Calcedony ，为隐晶石英的统称）。英文名源于发现地-西西里西南部埃格特兹河。
noun
1. a milky or greyish translucent to transparent quartz
Synonym: chalcedony