Last Updated：2025/11/21

(mineralogy) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

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biotite

Source Word

biotite

IPA(Pronunciation)

countable uncountable

(mineralogy) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

Japanese Meaning

暗褐色の雲母。カリウム、マグネシウム、鉄を含む混合アルミノケイ酸塩およびフッ化物。

The geologist carefully examined the slab and noted the shimmering flakes of biotite embedded within the granite.

地質学者は板を注意深く調べ、花崗岩に埋まった黒雲母のきらめく薄片に気付いた。

Sense（1）

(mineralogy) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

biotites

（ plural ）