玉ぎょく髄ずいぎょくずいMeanings1nounchalcedonymineralogyA mineral term for a cryptocrystalline form of silica; used in geology and gemology.玉ぎょく髄ずいは石せき英えいの一いっ種しゅで、瑪め瑙のうや碧へき玉ぎょくなども含ふくまれる。Chalcedony is a type of quartz, and includes agate and jasper.
