Opal CL/PL measurement, Gorobets and Rogojine 2002; Gotze 2000

Reference	Gorobets B.S., Rogojine A.A. (2002). Luminescent Spectra of Minerals: Reference Book. All-Russia Institute of Mineral Resources. Moscow. - P. 208. - Fig. 13.3. - P. 264. - Fig. 23.2.
Material	Opal [ SiO₂·nH₂O ] Dark Jubilee Opal specimen (318.44ct) from Coober Pedy, South Australia, Australia Photo by Chip Clark, via Smithsonian National Museum of Natural History
Specimen temperature	Ambient
Analysis technique	CL/PL
Lines	Singlet-triplet 440 nm, {{linesearch:1a8b8008-b823-4f96-9d54-2e35a88c2e5a\|Unspecified}}: 400 nm, 410 nm, 520 nm, 540 nm, 550 nm

Nominal composition of Opal [ SiO₂·nH₂O ].
Element	Atoms	At%	Wt%
H	3.47	3.47	0.181
Si	32.24	32.24	46.73
O	64.29	64.29	53.09
Total	100	100	100