The best replacement for muscovite is phlogopite.

The best alternatives to muscovite are rated as following:
★★★★★  phlogopite
★★★★★  biotite
★★★  mica
★  illite

Your alternative for muscovite is not listed? Suggest!
Speaking about muscovite, one probably shouldn't forget about aquamarine.

Other search terms related to muscovite and their ratings are:
★★★★★ aquamarine
You have in mind a companion for muscovite and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of muscovite in all years. Click on graph for more.
muscovite
phlogopite
biotite