Biotite

[baiәtait]

解釋/意思:

(noun.) dark brown to black mica found in igneous and metamorphic rock.

手打:鲁迪--From WordNet

解釋/意思:

(n.) Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.

艾德琳校對