Black Spinel-A Gem Material from Bo Phloi, Thailand

J 2020

Black Spinel-A Gem Material from Bo Phloi, Thailand

KRUZSLICZ, Agnes Blanka; Lutz NASDALA; Manfred WILDNER; Radek ŠKODA; Guenther J. REDHAMMER et. al.

Základní údaje

Originální název

Black Spinel-A Gem Material from Bo Phloi, Thailand

Autoři

KRUZSLICZ, Agnes Blanka; Lutz NASDALA (garant); Manfred WILDNER; Radek ŠKODA (203 Česká republika, domácí); Guenther J. REDHAMMER; Christoph HAUZENBERGER a Bhuwadol WANTHANACHAISAENG

Vydání

Journal of Gemmology, London, Gemmological Association of Great Britain, 2020, 1355-4565

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.375

Kód RIV

RIV/00216224:14310/20:00117072

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.15506/JoG.2020.37.1.66

UT WoS

000521739500013

EID Scopus

2-s2.0-85102521641

Klíčová slova anglicky

Bo Phloi gem; Crystal chemistry; Thailand

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 3. 2021 17:14, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

The Bo Phloi gem field in Kanchanaburi Province, western Thailand, is renowned mostly for its blue sapphire. Corundum production has now virtually ceased, so local gem cutters are focusing on high-quality black spinel, which is abundant from past stockpiles, to produce various jewellery items and carvings. A detailed mineralogical characterisation of this material showed that it is spinel sensu stricto (MgAl2O4) with elevated Fe contents (20.7 +/- 0.9 wt.% FeO, or Mg:Fe atomic ratio about 2:1). The enriched Fe causes the dark colouration of the material. Based on Mossbauer spectroscopic results, Fe occurs in both divalent and trivalent states, the latter occupying both (four-and six-coordinated) cation sites in the crystal structure. The Fe3+ contributes to a 'partially inverse' occupation of the cation sites. As a result, the Raman spectrum of Bo Phloi material does not resemble that of 'normal' spinel, but rather is similar to the spectra of other spinel-group minerals that tend to show some inversion in their cation-site occupation, such as hercynite, magnetite and magnesioferrite.

Citovat

KRUZSLICZ, Agnes Blanka; Lutz NASDALA; Manfred WILDNER; Radek ŠKODA; Guenther J. REDHAMMER; Christoph HAUZENBERGER a Bhuwadol WANTHANACHAISAENG. Black Spinel-A Gem Material from Bo Phloi, Thailand. Journal of Gemmology. London: Gemmological Association of Great Britain, 2020, roč. 37, č. 1, s. 66-79. ISSN 1355-4565. Dostupné z: https://doi.org/10.15506/JoG.2020.37.1.66.

@article{1698997,
   author = {Kruzslicz, Agnes Blanka and Nasdala, Lutz and Wildner, Manfred and Škoda, Radek and Redhammer, Guenther J. and Hauzenberger, Christoph and Wanthanachaisaeng, Bhuwadol},
   article_location = {London},
   article_number = {1},
   doi = {https://doi.org/10.15506/JoG.2020.37.1.66},
   keywords = {Bo Phloi gem; Crystal chemistry; Thailand},
   language = {eng},
   issn = {1355-4565},
   journal = {Journal of Gemmology},
   title = {Black Spinel-A Gem Material from Bo Phloi, Thailand},
   url = {https://www.univie.ac.at/Mineralogie/docs/BlackSpinel_JoG2020_37_1.pdf},
   volume = {37},
   year = {2020}
}

TY  - JOUR
ID  - 1698997
AU  - Kruzslicz, Agnes Blanka - Nasdala, Lutz - Wildner, Manfred - Škoda, Radek - Redhammer, Guenther J. - Hauzenberger, Christoph - Wanthanachaisaeng, Bhuwadol
PY  - 2020
TI  - Black Spinel-A Gem Material from Bo Phloi, Thailand
JF  - Journal of Gemmology
VL  - 37
IS  - 1
SP  - 66-79
EP  - 66-79
PB  - Gemmological Association of Great Britain
SN  - 13554565
KW  - Bo Phloi gem
KW  - Crystal chemistry
KW  - Thailand
UR  - https://www.univie.ac.at/Mineralogie/docs/BlackSpinel_JoG2020_37_1.pdf
L2  - https://www.univie.ac.at/Mineralogie/docs/BlackSpinel_JoG2020_37_1.pdf
N2  - The Bo Phloi gem field in Kanchanaburi Province, western Thailand, is renowned mostly for its blue sapphire. Corundum production has now virtually ceased, so local gem cutters are focusing on high-quality black spinel, which is abundant from past stockpiles, to produce various jewellery items and carvings. A detailed mineralogical characterisation of this material showed that it is spinel sensu stricto (MgAl2O4) with elevated Fe contents (20.7 +/- 0.9 wt.% FeO, or Mg:Fe atomic ratio about 2:1). The enriched Fe causes the dark colouration of the material. Based on Mossbauer spectroscopic results, Fe occurs in both divalent and trivalent states, the latter occupying both (four-and six-coordinated) cation sites in the crystal structure. The Fe3+ contributes to a 'partially inverse' occupation of the cation sites. As a result, the Raman spectrum of Bo Phloi material does not resemble that of 'normal' spinel, but rather is similar to the spectra of other spinel-group minerals that tend to show some inversion in their cation-site occupation, such as hercynite, magnetite and magnesioferrite.
ER  -

KRUZSLICZ, Agnes Blanka; Lutz NASDALA; Manfred WILDNER; Radek ŠKODA; Guenther J. REDHAMMER; Christoph HAUZENBERGER a Bhuwadol WANTHANACHAISAENG. Black Spinel-A Gem Material from Bo Phloi, Thailand. \textit{Journal of Gemmology}. London: Gemmological Association of Great Britain, 2020, roč.~37, č.~1, s.~66-79. ISSN~1355-4565. Dostupné z: https://doi.org/10.15506/JoG.2020.37.1.66.

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