Word I Learned Today: Adularescence

I have to say it's fairly unusual for me to hear a word I'm not familiar with, but just now, flipping around the channels, I stopped at home shopping to look at these earrings, and the woman used the term "adularescence" -- never heard of it, but I thought it was something about light similar to phosphorescence or iridescence.

Looked it up -- these were moonstone earrings -- and the word means:

having or emitting a milky or bluish iridescence