Color Characteristics of Blue to Yellow Beryl from Multiple Origins

Yang, Hu; Liu, Ren

doi:10.5741/gems.56.1.54

Cited by 11 publications

(11 citation statements)

References 9 publications

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“…The relative concentrations of each alkali element showed similar variation in all samples. This tendency may result from the fact that when the charge deficiency initiated by Li + substitutes Be 2+ , it is compensated by a proportional amount of Na + and Cs + and a minor amount of K + and Rb + [20]. NA has the highest alkali content, which is consistent with the conclusion obtained through the Raman spectrum.…”

Section: Chemical Compositionssupporting

confidence: 87%

Gemology, Spectroscopy, and Mineralogy Study of Aquamarines of Three Different Origins

Cui,

Xu,

Shen

et al. 2023

Crystals

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New aquamarine deposits have been found around the world in recent years, and how to compare and distinguish aquamarines of different origin has become a significant problem. Aquamarines from Koktokay, Minas Gerais, and Namaqualand were collected for standard gemology tests, spectroscopy, and chemical analysis in this paper. The spectroscopy experiment included infrared spectroscopy and Raman spectroscopy. Chemical composition analysis comprises electron microprobe and laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS). The results show that infrared absorption peaks related to [Fe2(OH)4] and NaH are found in Koktokay and Minas Gerais aquamarines, respectively. Compared with other two origins, Namaqualand aquamarine have strongest type II water Raman peak related to alkali metal content. Compared with aquamarines from other sources, aquamarines from Xinjiang and Minas Gerais are characterized by relatively high aluminum and low alkali contents in chemical composition, while Namaqualand aquamarine have a high scandium content.

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Section: Chemical Compositionssupporting

confidence: 87%

Gemology, Spectroscopy, and Mineralogy Study of Aquamarines of Three Different Origins

Cui,

Xu,

Shen

et al. 2023

Crystals

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“…The presence of molecular H 2 O in both the orientations-i.e., "type I" and "type II"-can be also confirmed on the basis of the overtones and recombination bands of H 2 O in the spectral range between 8000 and 4000 cm −1 . In the synthetic samples of this study, we observed absorption bands related to "type I" H 2 O at 7143, 6820, 5450, 5275, and 5107 cm −1 and to "type II" at 7107, 7079, and 5275 cm −1 [4,5,[42][43][44]. In the natural red beryl, these combination bands and overtones of H 2 O are not detectable, in agreement with the very low content of water in this crystal.…”

Section: Infrared Spectrasupporting

confidence: 81%

A Multi-Methodological Investigation of Natural and Synthetic Red Beryl Gemstones

et al. 2022

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In this study, we report the experimental findings of a multi-methodological and comparative investigation of a natural (from the Wah Wah Mountains of Beaver County, Utah) and three synthetic (hydrothermally grown) gem-quality red beryls by means of: gemmological standard testing, laser ablation inductively coupled mass spectroscopy, infrared and Raman spectroscopy, ultraviolet–visible–near infrared absorption spectroscopy, and single-crystal X-ray diffraction. Gemmological, crystallo-chemical, and spectroscopic features of the natural and synthetic stones enabled us to unveil the causes of their color (from red, to purplish-red, or orange-red) and how different and complementary techniques can be efficiently used to discriminate between natural and synthetic materials, based on non-destructive, micro-destructive, and destructive techniques.

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“…The K 2 O content is between 0.01 and 0.45 wt%. The Cs 2 O content is between 0.161 and 0.247 wt%, and the ratio of Na [18,[20][21][22]55].…”

Section: Major and Trace Elementsmentioning

confidence: 99%

“…As observed in Figure 13, aquamarine in most areas belongs to the "low-alkali beryl" area, including Longzi aquamarine. [18,[20][21][22]55].…”

Section: Major and Trace Elementsmentioning

confidence: 99%

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A Study on Beryl in the Cuonadong Be-W-Sn Polymetallic Deposit, Longzi County, Tibet, China

Shen

Cui

et al. 2021

Crystals

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Recently, aquamarine was discovered in the Cuonadong Be-W-Sn Polymetallic Deposit, Longzi County, Tibet. Longzi aquamarine is being extracted and is expected to be available over the next decade. This study provides a full set of data through standard gemmological properties, including scenes, color characteristics and advanced spectroscopic and chemical analyses, including micro ultraviolet–visible–near-infrared (UV–Vis–NIR), Raman and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The main inclusions in Longzi aquamarine are gas–liquid inclusions and a great number of quartz inclusions. The content of type I H2O is greater than that of type II H2O because of the low-alkali metal content, and “tetrahedral” substitutions and “octahedral” substitutions exist at the same time.

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Color Characteristics of Blue to Yellow Beryl from Multiple Origins

Abstract: G em beryl is a significant gem species, including color varieties such as emerald, aquamarine, heliodor, goshenite, morganite, and red beryl. Blue to yellow beryl has been found in numerous locations, including Brazil,

Cited by 11 publications

References 9 publications

Gemology, Spectroscopy, and Mineralogy Study of Aquamarines of Three Different Origins

Gemology, Spectroscopy, and Mineralogy Study of Aquamarines of Three Different Origins

A Multi-Methodological Investigation of Natural and Synthetic Red Beryl Gemstones

A Study on Beryl in the Cuonadong Be-W-Sn Polymetallic Deposit, Longzi County, Tibet, China

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