Tugtupite PL/XL measurement, x-ray beam, 77K, Gaft <i>et al.</i> 1982; Khomiakov 1990; Tarashchan 1978

Tugtupite PL/XL measurement, x-ray beam, 77K, Gaft et al. 1982; Khomiakov 1990; Tarashchan 1978

Reference	Gaft M.L., Gorobets B.S. and Khomyakov A.P. Luminescent acid-alkali and redox indicators in minerals from hyperagpaitic rocks. - Dokladi Akademii Nauk SSSR. - 1982. - V. 263. - No. 3. - P. 1445-1450. ; Khomiakov 1990 ; Tarashchan A.N. Luminescence of Minerals. - Kyiv: Naukova Dumka. - 1978. - 296p.
Material	Tugtupite [ Na₄BeAlSi₄O₁₂Cl ] Luminescence of tugtupite under longwave UV illumination, from Tunulliarfik Fjord, IlÍmaussaq complex, Narsaq, Kujalleq, Greenland Photo by Géry PARENT (via Wikimedia Commons). CC-BY-SA 4.0
Specimen temperature	77K
Analysis technique	X-ray photoluminescence
Probe	X-ray beam
Line	Unspecified 540 nm

Nominal composition of Tugtupite [ Na₄BeAlSi₄O₁₂Cl ].
Element	Atoms	At%	Wt%
Na	4	17.4	19.7
Al	1	4.35	5.77
Be	1	4.35	1.93
Si	4	17.4	24
O	12	52.2	41
Cl	1	4.35	7.58
Total	23	100	100