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单词
bertrandite
释义
bertrandite
bertrandite
[
′bər·trən‚dīt
]
(mineralogy)
Be
4
Si
2
O
7
(OH)
2
A colorless or pale-yellow mineral consisting of a beryllium silicate occurring in prismatic crystals; hardness is 6-7 on Mohs scale, and specific gravity is 2.59-2.60.
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更新时间:2025/10/9 20:14:13