Muscovite's name derives from its use in "Muscovy glass" in 17th century Russia. It easily breaks into very thin, translucent sheets that were cheaper than glass. This property means it has a wide range of industrial applications today. Vote muscovite!
I had read that mica was also present in ochre from the Wilgie Mia mine, Western Australia, which has been in continuous operation for at least TWENTY THOUSAND YEARS, but apparently its characteristic sheen is actually from particles of hematite
hematite (the main component of ochre) is not appearing in the mineral cup this year but i have a LOT to say about quartz
You can follow @AsFarce.
Tip: mention @twtextapp on a Twitter thread with the keyword “unroll” to get a link to it.

Latest Threads Unrolled: