| HANUS, Radek, Kamil SOBEK, Kamila JOHNOVÁ, Tomáš TROJEK, Ján ŠTUBŇA, Tomáš HANUS and Kamila JUNGMANNOVÁ. Hyalite Opal from Erongo, Namibia, Showing Green Daylight Fluorescence. Journal of Gemmology. Gemmological Association of Great Britain, 2022, vol. 38, No 2, p. 172-182. ISSN 1355-4565. Available from: https://dx.doi.org/10.15506/JoG.2022.38.2.172. |
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@article{1860608,
author = {Hanus, Radek and Sobek, Kamil and Johnová, Kamila and Trojek, Tomáš and Štubňa, Ján and Hanus, Tomáš and Jungmannová, Kamila},
article_number = {2},
doi = {http://dx.doi.org/10.15506/JoG.2022.38.2.172},
keywords = {Hyalite; Uranyl ion; Raman spectroscopy; Gamma spectroscopy; Photoluminescence},
language = {eng},
issn = {1355-4565},
journal = {Journal of Gemmology},
title = {Hyalite Opal from Erongo, Namibia, Showing Green Daylight Fluorescence},
url = {https://gem-a.com/jog-volume-38-issue-2-2022},
volume = {38},
year = {2022}
}
TY - JOUR
ID - 1860608
AU - Hanus, Radek - Sobek, Kamil - Johnová, Kamila - Trojek, Tomáš - Štubňa, Ján - Hanus, Tomáš - Jungmannová, Kamila
PY - 2022
TI - Hyalite Opal from Erongo, Namibia, Showing Green Daylight Fluorescence
JF - Journal of Gemmology
VL - 38
IS - 2
SP - 172-182
EP - 172-182
PB - Gemmological Association of Great Britain
SN - 13554565
KW - Hyalite
KW - Uranyl ion
KW - Raman spectroscopy
KW - Gamma spectroscopy
KW - Photoluminescence
UR - https://gem-a.com/jog-volume-38-issue-2-2022
N2 - Rare hyalite opal showing green daylight fluorescence was discovered in the Erongo region, Namibia, sometime prior to 2000. Raman spectroscopy confirms this hyalite to be opal-A, and the most interesting feature of the Raman spectra are bands associated with the hydroxyl-stretching regions in the mineral’s structure. A doublet at 3602/3665 cm–1 appears to be unique to opal from this locality and may be due to the vibration of water in an unusual structural-binding arrangement. Trace amounts of the uranyl molecule (UO2)2+ are responsible for the luminescence, which is unevenly distributed according to the opal’s botryoidal structure. Measured radioactivity values are similar to those reported for other daylight-fluorescing opals (e.g. from Mexico), and are well below the global average terrestrial gamma dose rate.
ER -
HANUS, Radek, Kamil SOBEK, Kamila JOHNOVÁ, Tomáš TROJEK, Ján ŠTUBŇA, Tomáš HANUS and Kamila JUNGMANNOVÁ. Hyalite Opal from Erongo, Namibia, Showing Green Daylight Fluorescence. \textit{Journal of Gemmology}. Gemmological Association of Great Britain, 2022, vol.~38, No~2, p.~172-182. ISSN~1355-4565. Available from: https://dx.doi.org/10.15506/JoG.2022.38.2.172.
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