also: うんぼ · きらら
noun
mica; isinglass
A group of sheet silicate minerals; in geology and materials science. Isinglass is an older term for thin sheets of mica, especially when used as a transparent material.
雲母は電気絶縁性に優れている。
Mica has excellent electrical insulating properties.
この岩石には黒雲母が多く含ま
This rock contains a lot of biotite.
Archaic or poetic reading; sometimes seen in older texts or as a name.
The kanji 雲 (cloud) and 母 (mother) are used for their sounds (ateji) rather than their meanings; the word is of native Japanese origin, and the exact derivation is uncertain.