Layered mineral (4)

I believe the answer is:

mica

'layered mineral' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for mica that I've seen before include "Isinglass" , "Flexible mineral found in igneous and metamorphic rocks" , "Transparent mineral" , "Semitransparent insulating mineral" , "Shiny silicate mineral" .)

I've seen this clue in the Universal, the King Feature Syndicate, the Penny Press and the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.