Common gem opal: An investigation of micro- to nano-structureDOI: info:10.2138/am.2008.2518v. 93No. 11-12MINERALOGICAL SOC AMER1865–1873
Gaillou, Eloise, Fritsch, Emmanuel, Aguilar-Reyes, Bertha, Rondeau, Benjamin, Post, Jeffrey E., Barreau, Alain, and Ostroumov, Mikhail. 2008. "Common gem opal: An investigation of micro- to nano-structure." American Mineralogist, 93, (11-12) 1865–1873. https://doi.org/10.2138/am.2008.2518.