Gaillou, Eloise; Fritsch, Emmanuel; Aguilar-Reyes, Bertha; Rondeau, Benjamin; Post, Jeffrey E.; Barreau, Alain; Ostroumov, Mikhail
(2008)
The microstructure of nearly 200 common gem opal-A and opal-CT samples from worldwide localities was investigated using scanning electron microscopy (SEM). These opals do not show play-of-color, but are valued in the gem ...