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@article{1727817,
author = {Bačík, Peter and Fridrichová, Jana and Štubňa, Ján and Bancík, Tomáš and Illášová, Ľudmila and Pálková, Helena and Škoda, Radek and Mikuš, Tomáš and Milovská, Stanislava and Vaculovič, Tomáš and Sečkár, Peter},
article_location = {Basel},
article_number = {11},
doi = {http://dx.doi.org/10.3390/min10111001},
keywords = {hydroxylapatite; REE; Raman spectroscopy; photoluminescence; optical absorption spectroscopy; gem},
language = {eng},
issn = {2075-163X},
journal = {Minerals},
title = {The REE-Induced Absorption and Luminescence in Yellow Gem-Quality Durango-Type Hydroxylapatite from Muranska Dlha Luka, Slovakia},
url = {https://doi.org/10.3390/min10111001},
volume = {10},
year = {2020}
}
TY - JOUR
ID - 1727817
AU - Bačík, Peter - Fridrichová, Jana - Štubňa, Ján - Bancík, Tomáš - Illášová, Ľudmila - Pálková, Helena - Škoda, Radek - Mikuš, Tomáš - Milovská, Stanislava - Vaculovič, Tomáš - Sečkár, Peter
PY - 2020
TI - The REE-Induced Absorption and Luminescence in Yellow Gem-Quality Durango-Type Hydroxylapatite from Muranska Dlha Luka, Slovakia
JF - Minerals
VL - 10
IS - 11
SP - 1-21
EP - 1-21
PB - MDPI
SN - 2075163X
KW - hydroxylapatite
KW - REE
KW - Raman spectroscopy
KW - photoluminescence
KW - optical absorption spectroscopy
KW - gem
UR - https://doi.org/10.3390/min10111001
L2 - https://doi.org/10.3390/min10111001
N2 - In talc-magnesite veins in serpentinite near Muranska Dlha Luka (MDL), Slovakia, yellow euhedral to subhedral crystals apatite of a gem quality occur. It has a composition of hydroxylapatite with F- varying between 0.29 and 0.34 apfu, Cl- in range of 0.02-0.05 apfu and calculated OH- content between 0.62-0.68 apfu. Moreover, [CO3](2-) molecules were identified by FTIR and Raman spectroscopy. MDL apatite contains only up to 0.003 apfu As5+ and Si4+ substituting for P5+; Ca is substituted by small amount of Na, Fe2+, Mn2+ (all up to 0.006 apfu), and Rare Earth Elements (REE-in total up to 0.017 apfu). Compared to trace-element composition of similar apatites from Durango, Mexico, the REE content in MDL apatite is around ten times lower with Nd > Ce >> La, its chondrite-normalized REE pattern has almost a horizontal slope and larger negative Eu anomaly. The MDL apatite is richer in Mn, Pb and Li, but poorer in As, V, Th and U. The concentrations of Sr and Y are similar. In the optical absorption spectra, the most prominent bands are at 585-590 nm (Nd3+) and between 600 and 800 nm (Mn2+, Ce3+-SiO3- photochromic center and Nd3+). The photoluminescence spectrum of MDL apatite shows bands between 550 and 620 nm (Dy3+, Sm3+, Pr3+ and also Mn2+) which likely enhance its yellow color. MDL hydroxylapatite likely formed from fluids derived from granitic rocks as evidenced by the chondrite-normalized REE patterns, Li, Mn and Y concentrations. The Sr content reflects the host-rock serpentinite composition. Fluids for its crystallization were likely derived from Muran complex orthogneisses by the Alpine deformation and recrystallization in greenschist to lower amphibolite facies.
ER -
BAČÍK, Peter, Jana FRIDRICHOVÁ, Ján ŠTUBŇA, Tomáš BANCÍK, Ľudmila ILLÁŠOVÁ, Helena PÁLKOVÁ, Radek ŠKODA, Tomáš MIKUŠ, Stanislava MILOVSKÁ, Tomáš VACULOVIČ a Peter SEČKÁR. The REE-Induced Absorption and Luminescence in Yellow Gem-Quality Durango-Type Hydroxylapatite from Muranska Dlha Luka, Slovakia. \textit{Minerals}. Basel: MDPI, roč.~10, č.~11, s.~1-21. ISSN~2075-163X. doi:10.3390/min10111001. 2020.
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