| 单词 | spinel |
| 释义 | spinel /spi nel", spin"l/, n. 1. any of a group of minerals composed principally of oxides of magnesium, aluminum, iron, manganese, chromium, etc., characterized by their hardness and octahedral crystals. 2. a mineral of this group, essentially magnesium aluminate, MgAl2O4, some varieties being used as gems. Also, spinelle. [1520-30; < F spinelle < It spinella, equiv. to spin(a) thorn ( < L spina) + -ella -ELLE] |
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