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Title: Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA

Abstract

Abstract Leószilárdite (IMA2015-128), Na 6Mg(UO 2) 2(CO 3) 6·6H 2O, was found in the Markey Mine, Red Canyon, White Canyon District, San Juan County, Utah, USA, in areas with abundant andersonite, natrozippeite, gypsum, anhydrite, and probable hydromagnesite along with other secondary uranium minerals bayleyite, čejkaite and johannite. The new mineral occurs as aggregates of pale yellow bladed crystals flattened on ﹛001﹜ and elongated along [010], individually reaching up to 0.2 mmlong. More commonly it occurs as pale yellow pearlescent masses to 2 mm consisting of very small plates. Leószilárdite fluoresces green under both longwave and shortwave ultraviolet light, and is translucent with a white streak, hardness of 2 (Mohs), and brittle tenacity with uneven fracture. The new mineral is readily soluble in room temperature H 2O. Crystals have perfect cleavage along ﹛001﹜, and exhibit the forms ﹛110﹜,﹛001﹜,﹛100﹜,﹛101﹜ and ﹛101﹜. Optically, leószilárdite is biaxial (-), α= 1.504(1), β= 1.597(1),γ= 1.628(1) (white light); 2V (meas.) = 57(1)°, 2V (calc.) = 57.1°; dispersionr>v, slight. Pleochroism:X= colourless,YandZ= light yellow;X<Y≈ZThe average of six wavelength dispersive spectroscopic analyses provided Na 2O 14.54, MgO 3.05, UO 347.95, CO 222.13, H 2O 9.51, total 97.18 wt.%. The empirical formula is Na 5.60Mg 0.90U 2O 28C 6H 12.60, basedmore » on 28 O apfu. Leószilárdite is monoclinic,C2/m, a= 11.6093(21),b= 6.7843(13),c= 15.1058(28) Å, β = 91.378(3)°,V= 1189.4(4) Å 3andZ= 2. The crystal structure (R 1= 0.0387 for 1394 reflections with I obs> 4σI), consists of uranyl tricarbonate anion clusters [(UO 2)(CO 3) 3] 4-held together in part by irregular chains of NaO 5(H 2O) polyhedra sub parallel to [010]. Individual uranyl tricarbonate clusters are also linked together by three-octahedron units consisting of two Na-centred octahedra that share the opposite faces of a Mg-centred octahedron at the centre (Na–Mg–Na), and have the composition Na 2MgO 12(H 2O) 4. The name of the new mineral honours the Hungarian-American physicist, inventor and biologist Dr. Leó Szilárd (1898–1964).« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Notre Dame, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1541877
DOE Contract Number:  
FG02-07ER15880
Resource Type:
Journal Article
Journal Name:
Mineralogical Magazine
Additional Journal Information:
Journal Volume: 81; Journal Issue: 5; Journal ID: ISSN 0026-461X
Publisher:
Mineralogical Society
Country of Publication:
United States
Language:
English
Subject:
Mineralogy

Citation Formats

Olds, Travis A., Sadergaski, Luke R., Plášil, Jakub, Kampf, Anthony R., Burns, Peter C., Steele, Ian M., Marty, Joe, Carlson, Shawn M., and Mills, Owen P. Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA. United States: N. p., 2017. Web. doi:10.1180/minmag.2016.080.149.
Olds, Travis A., Sadergaski, Luke R., Plášil, Jakub, Kampf, Anthony R., Burns, Peter C., Steele, Ian M., Marty, Joe, Carlson, Shawn M., & Mills, Owen P. Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA. United States. doi:10.1180/minmag.2016.080.149.
Olds, Travis A., Sadergaski, Luke R., Plášil, Jakub, Kampf, Anthony R., Burns, Peter C., Steele, Ian M., Marty, Joe, Carlson, Shawn M., and Mills, Owen P. Sun . "Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA". United States. doi:10.1180/minmag.2016.080.149.
@article{osti_1541877,
title = {Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA},
author = {Olds, Travis A. and Sadergaski, Luke R. and Plášil, Jakub and Kampf, Anthony R. and Burns, Peter C. and Steele, Ian M. and Marty, Joe and Carlson, Shawn M. and Mills, Owen P.},
abstractNote = {Abstract Leószilárdite (IMA2015-128), Na6Mg(UO2)2(CO3)6·6H2O, was found in the Markey Mine, Red Canyon, White Canyon District, San Juan County, Utah, USA, in areas with abundant andersonite, natrozippeite, gypsum, anhydrite, and probable hydromagnesite along with other secondary uranium minerals bayleyite, čejkaite and johannite. The new mineral occurs as aggregates of pale yellow bladed crystals flattened on ﹛001﹜ and elongated along [010], individually reaching up to 0.2 mmlong. More commonly it occurs as pale yellow pearlescent masses to 2 mm consisting of very small plates. Leószilárdite fluoresces green under both longwave and shortwave ultraviolet light, and is translucent with a white streak, hardness of 2 (Mohs), and brittle tenacity with uneven fracture. The new mineral is readily soluble in room temperature H2O. Crystals have perfect cleavage along ﹛001﹜, and exhibit the forms ﹛110﹜,﹛001﹜,﹛100﹜,﹛101﹜ and ﹛101﹜. Optically, leószilárdite is biaxial (-), α= 1.504(1), β= 1.597(1),γ= 1.628(1) (white light); 2V (meas.) = 57(1)°, 2V (calc.) = 57.1°; dispersionr>v, slight. Pleochroism:X= colourless,YandZ= light yellow;X<Y≈ZThe average of six wavelength dispersive spectroscopic analyses provided Na2O 14.54, MgO 3.05, UO347.95, CO222.13, H2O 9.51, total 97.18 wt.%. The empirical formula is Na5.60Mg0.90U2O28C6H12.60, based on 28 O apfu. Leószilárdite is monoclinic,C2/m, a= 11.6093(21),b= 6.7843(13),c= 15.1058(28) Å, β = 91.378(3)°,V= 1189.4(4) Å3andZ= 2. The crystal structure (R1= 0.0387 for 1394 reflections with Iobs> 4σI), consists of uranyl tricarbonate anion clusters [(UO2)(CO3)3]4-held together in part by irregular chains of NaO5(H2O) polyhedra sub parallel to [010]. Individual uranyl tricarbonate clusters are also linked together by three-octahedron units consisting of two Na-centred octahedra that share the opposite faces of a Mg-centred octahedron at the centre (Na–Mg–Na), and have the composition Na2MgO12(H2O)4. The name of the new mineral honours the Hungarian-American physicist, inventor and biologist Dr. Leó Szilárd (1898–1964).},
doi = {10.1180/minmag.2016.080.149},
journal = {Mineralogical Magazine},
issn = {0026-461X},
number = 5,
volume = 81,
place = {United States},
year = {2017},
month = {10}
}