Research output: Contribution to journal › Article › peer-review
Preiswerkite: A First Occurrence in Marble Hosting Gem Spinel Deposits, Luc Yen, Vietnam. / Krivovichev, Vladimir G.; Kuksa, Katherine A.; Sokolov, Pavel B.; Marakhovskaya, Olga Yu.; Zolotarev, Andrey A.; Bocharov, Vladimir N. ; Semenova, Tatyana F. ; Klimacheva, Maria E.; Gussiås, Geir Atle .
In: Minerals, Vol. 12, No. 8, 1024, 15.08.2022.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Preiswerkite: A First Occurrence in Marble Hosting Gem Spinel Deposits, Luc Yen, Vietnam
AU - Krivovichev, Vladimir G.
AU - Kuksa, Katherine A.
AU - Sokolov, Pavel B.
AU - Marakhovskaya, Olga Yu.
AU - Zolotarev, Andrey A.
AU - Bocharov, Vladimir N.
AU - Semenova, Tatyana F.
AU - Klimacheva, Maria E.
AU - Gussiås, Geir Atle
N1 - Publisher Copyright: © 2022 by the authors.
PY - 2022/8/15
Y1 - 2022/8/15
N2 - We report a new occurrence of preiswerkite, the rare sodium analog of eastonite, the trioctahedral mica, from marble-hosted noble spinel deposits of the Luc Yen district, northern Vietnam. It is found in marble for the first time. The preiswerkite is anhedral and associated with phlogopite, aspidolite, sadanagaite, pargasite, spinel, corundum, dolomite and calcite. The average compositions of preiswerkite is (Na0.88Ca0.08K0.01)Σ0.97(Mg2.29Al0.72Fe0.04)Σ3.05)[(Al1.95Si2.05)Σ4.00O10](OH)2. The compositions of preiswerkite have a narrow range of Mg# values (0.96–0.99) and define a preiswerkite-aspidolite solid-solution series. Compared with other occurrences, the Luc Yen preiswerkite has a low iron content, which attains 0.09 atoms per formula unit (1.53 wt.% FeO). The formation of preiswerkite is favored by the proportion of Mg, Al and Si in the precursor rocks and the increased activity of sodium and H2O in the fluid phase.
AB - We report a new occurrence of preiswerkite, the rare sodium analog of eastonite, the trioctahedral mica, from marble-hosted noble spinel deposits of the Luc Yen district, northern Vietnam. It is found in marble for the first time. The preiswerkite is anhedral and associated with phlogopite, aspidolite, sadanagaite, pargasite, spinel, corundum, dolomite and calcite. The average compositions of preiswerkite is (Na0.88Ca0.08K0.01)Σ0.97(Mg2.29Al0.72Fe0.04)Σ3.05)[(Al1.95Si2.05)Σ4.00O10](OH)2. The compositions of preiswerkite have a narrow range of Mg# values (0.96–0.99) and define a preiswerkite-aspidolite solid-solution series. Compared with other occurrences, the Luc Yen preiswerkite has a low iron content, which attains 0.09 atoms per formula unit (1.53 wt.% FeO). The formation of preiswerkite is favored by the proportion of Mg, Al and Si in the precursor rocks and the increased activity of sodium and H2O in the fluid phase.
KW - aspidolite
KW - Luc Yen district
KW - marble-hosted deposits
KW - noble spinel
KW - preiswerkite
KW - Raman spectrum
KW - trioctahedral mica
KW - Vietnam
UR - https://www.mendeley.com/catalogue/b6e704db-e582-3a2b-a3f9-8d63452be3fc/
UR - http://www.scopus.com/inward/record.url?scp=85138004577&partnerID=8YFLogxK
U2 - 10.3390/min12081024
DO - 10.3390/min12081024
M3 - Article
VL - 12
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 8
M1 - 1024
ER -
ID: 97971366