phlog·o·pite 
(flŏgə-pīt′)
(flŏgə-pīt′)n.
A yellow to dark brown mica, K(Mg,Fe)3AlSi3O10(OH)2, used in insulation.
[Greek phlogōpos, fiery-looking (phlox, phlog-, flame; see bhel-1 in the Appendix of Indo-European roots + ōps, ōp-, eye, face; see okw- in the Appendix of Indo-European roots) + -ITE1.]