the.com/mica
the mineral that splits into sheets so thin you can see through stone
means A group of shiny silicate minerals that cleave into thin, flexible, often transparent sheets, long used for insulation, windows, and that glittery sparkle in rocks and cosmetics.
from From Latin 'mica,' meaning 'crumb' or 'grain' — a tiny morsel, the sort of thing that flakes and glitters. The mineral's name was likely nudged along by association with Latin 'micare,' 'to shine' or 'to flash,' so the word carries both senses at once: a small crumb that catches the light. Whether the shimmer or the crumb came first, the two meanings have been entangled since antiquity.
- window glass
- used as transparent windows before glass got cheap
- cleaves flat
- peels into sheets one atom-layer at a time
- heat shield
- insulates toasters and irons, shrugging off 500°C
- glitter source
- the sparkle in eyeshadow and car paint
- old furnaces
- oven windows once made from ground-mica plates
muscovite mica — transparent silicate mineral from russia, used in electrical insulators and window panes since the 1600s
biotite mica — dark iron-rich mica found in granite deposits worldwide, makes up ~5% of earth's continental crust
phlogopite mica — magnesium-rich mica mined in madagascar and canada, used in high-temperature applications and cosmetics