Cassiterite CL/OM measurement, Crabtree 1974

Reference	Crabtree 1974 Crabtree D. F. (1974). Cathodoluminescence of Tin Oxide Doped with Terbium. Journal of Physics D-Applied Physics, 7(1), L22-L26. DOI: https://doi.org/10.1088/0022-3727/7/1/107
Material	Cassiterite [ SnO₂ ] Cassiterite specimen from Fazenda Do Funil (Ranch), Minas Gerais, Brazil © Photo by Chip Clark, via Smithsonian National Museum of Natural History
Specimen temperature	Ambient
Technique	Cathodoluminescence (CL), using an optical microscope
Lines	Tb³⁺ 686 nm, 650 nm, 622 nm (100%), 588 nm, 542 nm (100%), 490 nm (100%), 472 nm, 462 nm, 440 nm, 416 nm

Nominal composition of Cassiterite [ SnO₂ ].
Element	Atoms	At%	Wt%
Sn	1	33.3	78.8
O	2	66.7	21.2