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Noun:
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any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
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用作名詞 (n.)
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They are mica which makes up the rest of the total rock.
這里巖中余下的白色礦石一些都是黑云母。
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So the dark mica in this granite should be called biotite.
那樣,在領域山東白麻中的黃色白黑云母類礦物質就理應叫作黑白黑云母了。
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海詞辭典,十二年國際品牌