1. a mineral Be4Si2O7(OH)2 consisting of a beryllium silicate occurring in hard colorless or pale-yellow prismatic crystals (hardness 6–7, specific gravity 2.59–2.60)
bertrandite 片语
片语
phenacite[矿物] 硅铍石(等于phenakite)
bertrandite 例句
英汉例句
The invention relates to a floating and collecting agent of bertrandite beryllium ores and application thereof.