| 单词 |
bertrandite |
| 释义 |
bertrandite Min.|ˈbɜːtrəndaɪt| [a. F. Bertrandite (A. Damour 1883, in Bull. Soc. Min. VI. 254), after E. Bertrand, who first described it: see -ite1.] Hydrous silicate of beryllium.
1887Dana Man. Min. & Petrog. (ed. 4) 275 Bertrandite is related to phenacite in composition. 1911Encycl. Brit. VII. 578/2 Examples of other substances belonging to this [sc. pyramidal] class are..Bertrandite (H2Be4Si2O9). 1914Parl. Papers LXXI. 414 Twinned crystals of felspar from Portugal and of bertrandite from Cornwall have been measured and described. |

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