| 释义 |
玛瑙mǎnǎo矿物,主要成分是二氧化硅,有各种颜色,多呈层状或环状,质地坚硬耐磨,可用做磨具、仪表轴承等,也可做贵重的装饰品。{agate; chalcedony composed mainly of silicon dioxide, with multi-layered or curved bands of different hues, of a hard and wearable texture that makes it an ideal material for grinders and bearings for meters and apparatuses, and precious jewellery} |