Mica is a hard mineral which is found as small flat crystals in rocks. It has a great resistance to heat and electricity.
mica in British English
(ˈmaɪkə)
noun
any of a group of lustrous rock-forming minerals consisting of hydrous silicates of aluminium, potassium, etc, in monoclinic crystalline form, occurring in igneous and metamorphic rock. Because of their resistance to electricity and heat they are used as dielectrics, in heating elements, etc
Derived forms
micaceous (maɪˈkeɪʃəs)
adjective
Word origin
C18: from Latin: grain, morsel
mica in American English
(ˈmaɪkə)
noun
any of a group of minerals that are complex silicates that crystallize in thin, somewhat flexible, translucent or colored, easily separated layers, including muscovite, biotite, and lepidolite: mica is resistant to heat and electricity
Derived forms
micaceous (miˈcaceous) (mɪˈkeɪʃəs)
adjective
Word origin
ModL < L, a crumb, grain (< IE *(s)meik-, var. of base *(s)mei-, to smear, rub over > OE smitte, a smudge): sense infl. by micare, to shine, glitter < IE *meik-, to flicker, blink