Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Bertrandite

伯特兰石

Be4Si2O7(OH)2

Be₄Si₂O₇(OH)₂

This sample of bertrandite is displayed in the Smithsonian Museum of Natural History. Bertrandite is a silicate of beryllium with the composition Be4Si2O7(OH)2. The sample at left is about 5 cm across and is from Conselheiro Pena, Minas Gerais, Brazil. The sample is described as bertrandite with elbaite, cookeite and lepidolite.

这个伯兰地石样本陈列在史密森尼自然历史博物馆中。伯兰地石是一种含铍的硅酸盐，化学式为Be₄Si₂O₇(OH)₂。左侧的样本宽约5厘米，来自巴西米纳斯吉拉斯州的康塞拉多·佩纳。该样本被描述为伯兰地石，伴有埃拉比特、库克石和利佩利特石。

Mindat: Bertrandite

Mindat: 贝尔塔石
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