| HANUS, Radek, Kamil SOBEK, Kamila JOHNOVÁ, Tomáš TROJEK, Ján ŠTUBŇA, Tomáš HANUS a Kamila JUNGMANNOVÁ. Hyalite Opal from Erongo, Namibia, Showing Green Daylight Fluorescence. Journal of Gemmology. Gemmological Association of Great Britain, 2022, roč. 38, č. 2, s. 172-182. ISSN 1355-4565. Dostupné z: 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 a Kamila JUNGMANNOVÁ. Hyalite Opal from Erongo, Namibia, Showing Green Daylight Fluorescence. \textit{Journal of Gemmology}. Gemmological Association of Great Britain, 2022, roč.~38, č.~2, s.~172-182. ISSN~1355-4565. Dostupné z: https://dx.doi.org/10.15506/JoG.2022.38.2.172.
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