Scheelite measurement, Randall 1939

Reference	Randall 1939 Randall J. T. (1939). General introduction. Some recent experiments in luminescence. Transactions of the Faraday Society, 35 DOI: https://doi.org/10.1039/tf9393500002 https://doi.org/10.1039/TF9393500002
Material	Scheelite [ CaWO₄ ] Luminescence of scheelite (blue) on muscovite under UV shortwave illumination, from Yaogangxian Mine, Yaogangxian W-Sn ore field, Yizhang Co., Chenzhou Prefecture, Hunan Province, China © Photo by Géry PARENT (via Wikimedia Commons), Public Domain
Specimen temperature	Ambient
Technique	Unknown
Line	WO4^2- 435 nm

Nominal composition of Scheelite [ CaWO₄ ].
Element	Atoms	At%	Wt%
Ca	1	16.7	13.9
W	1	16.7	63.9
O	4	66.7	22.2