Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, a new
uranyl carbonate mineral from Jachymov, Czech Republic

J 2017

Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, a new uranyl carbonate mineral from Jachymov, Czech Republic

PLÁŠIL, Jakub, Jiří ČEJKA, Jiří SEJKORA, Jan HLOUŠEK, Radek ŠKODA et. al.

Basic information

Original name

Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, a new uranyl carbonate mineral from Jachymov, Czech Republic

Authors

PLÁŠIL, Jakub (203 Czech Republic), Jiří ČEJKA (203 Czech Republic), Jiří SEJKORA (203 Czech Republic), Jan HLOUŠEK (203 Czech Republic), Radek ŠKODA (203 Czech Republic, guarantor, belonging to the institution), Milan NOVÁK (203 Czech Republic, belonging to the institution), Michal DUŠEK (203 Czech Republic), Ivana CISAROVA (203 Czech Republic), Ivan NEMEC (203 Czech Republic) and Jana EDEROVA (203 Czech Republic)

Edition

Journal of Geosciences, Praha, Česká geologická společnost, 2017, 1802-6222

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10504 Mineralogy

Country of publisher

Czech Republic

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 1.415

RIV identification code

RIV/00216224:14310/17:00100334

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.3190/jgeosci.241

UT WoS

000417045600004

Keywords in English

Linekite; uranyl carbonate; crystal structure; Raman spectroscopy; Jachymov

Abstract

V originále

Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, is a new uranyl tricarbonate mineral from Jachymov, Western Bohemia, Czech Republic. It occurs in association with grimselite, andersonite, liebigite, cejkaite, schrockingerite, agricolaite, jezekite and braunerite. Linekite forms from uranium-rich aqueous solutions and its origin is associated with post-mining processes. Linekite is orthorhombic, space group Pnnm, with a = 17.0069(5) angstrom, b = 18.0273(5) angstrom, c = 18.3374(5) angstrom and V = 5622.1(2) angstrom(3), and Z = 8. It forms tabular, mostly isometric crystals, up to c. 0.5 mm across, typically in multiple intergrowths. The color is pale olive to khaki green and it has a greenish white to yellowish white streak. Crystals are transparent and have vitreous luster. The Mohs hardness is estimated to be between 2 and 3. Linekite is brittle with an uneven fracture and perfect cleavage on {100} and very good cleavage on {010}. It exhibits intense greenish yellow luminescence under both short-(254 nm) and long-wave (366 nm) UV radiation. The calculated density is 2.922 g/cm(3). The mineral is biaxial (+) with indices of refraction, alpha = 1.546(2), beta = 1.550, gamma = 1.562(2). The 2V(obs) is moderate; the calculated 2V is + 60 degrees. Optical orientation: Y = a, X = b, Z = c. The electron microprobe analyses (average of 28) provided: Na2O 0.06, K2O 6.89, CaO 14.11, CuO 0.12, UO3 48.76, CO2 * 22.51, H2O* 12.20 (similar to 12.9 from TG) (*calculated), total 104.65 wt%. The empirical formula (based on 30.22 O apfu) is: (K1.73Na0.02)(Sigma 1.75)(Ca2.97Cu0.02)(Sigma 2.99)[(UO2)(CO3)(3)](2.02)(H2O)(8.00). The Raman and infrared spectra exhibit prominent features consistent with the mineral being a hydrated uranyl tricarbonate, with fundamental vibrations of H2O molecules, CO(3)(2-)anions and UO22+ ions. The seven strongest powder X-ray diffraction lines are [d(obs) in angstrom (hkl) I-rel]: 8.627 (200) 100, 6.436 (022) 60, 5.935 (212) 11, 5.153 (222) 43, 4.592 (004) 19, 4.505 (040) 12 and 4.053 (204) 15. The structure of linekite was refined from single-crystal X-ray data to R = 0.034 for 4468 unique observed reflections (I-obs > 3 sigma I). The structure consists of prominent (Ca(H2O)(2)[(UO2)(CO3)(3)])(2-) layers parallel to (100), which define a square grid, leading to a strong tetragonal pseudosymmetry of linekite. Between the layers, disordered K+ cations and H2O molecules are localized. The structure is closely related to other uranyl tricarbonate minerals, e.g., albrechtschraufite and andersonite, due to the presence of a very characteristic paddle-wheel motif, Ca[(UO2)(CO3)(3)](4) Ca.

Links

MUNI/A/1316/2015, interní kód MU

Name: Geologické, geodynamické a environmentální procesy východního okraje Českého masívu (Acronym: Geodyn)

Investor: Masaryk University, Category A

Citovat

PLÁŠIL, Jakub, Jiří ČEJKA, Jiří SEJKORA, Jan HLOUŠEK, Radek ŠKODA, Milan NOVÁK, Michal DUŠEK, Ivana CISAROVA, Ivan NEMEC and Jana EDEROVA. Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, a new uranyl carbonate mineral from Jachymov, Czech Republic. Journal of Geosciences. Praha: Česká geologická společnost, 2017, vol. 62, No 3, p. 201-213. ISSN 1802-6222. Available from: https://dx.doi.org/10.3190/jgeosci.241.

@article{1411003,
   author = {Plášil, Jakub and Čejka, Jiří and Sejkora, Jiří and Hloušek, Jan and Škoda, Radek and Novák, Milan and Dušek, Michal and Cisarova, Ivana and Nemec, Ivan and Ederova, Jana},
   article_location = {Praha},
   article_number = {3},
   doi = {http://dx.doi.org/10.3190/jgeosci.241},
   keywords = {Linekite; uranyl carbonate; crystal structure; Raman spectroscopy; Jachymov},
   language = {eng},
   issn = {1802-6222},
   journal = {Journal of Geosciences},
   title = {Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, a new uranyl carbonate mineral from Jachymov, Czech Republic},
   volume = {62},
   year = {2017}
}

TY  - JOUR
ID  - 1411003
AU  - Plášil, Jakub - Čejka, Jiří - Sejkora, Jiří - Hloušek, Jan - Škoda, Radek - Novák, Milan - Dušek, Michal - Cisarova, Ivana - Nemec, Ivan - Ederova, Jana
PY  - 2017
TI  - Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, a new uranyl carbonate mineral from Jachymov, Czech Republic
JF  - Journal of Geosciences
VL  - 62
IS  - 3
SP  - 201-213
EP  - 201-213
PB  - Česká geologická společnost
SN  - 18026222
KW  - Linekite
KW  - uranyl carbonate
KW  - crystal structure
KW  - Raman spectroscopy
KW  - Jachymov
N2  - Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, is a new uranyl tricarbonate mineral from Jachymov, Western Bohemia, Czech Republic. It occurs in association with grimselite, andersonite, liebigite, cejkaite, schrockingerite, agricolaite, jezekite and braunerite. Linekite forms from uranium-rich aqueous solutions and its origin is associated with post-mining processes. Linekite is orthorhombic, space group Pnnm, with a = 17.0069(5) angstrom, b = 18.0273(5) angstrom, c = 18.3374(5) angstrom and V = 5622.1(2) angstrom(3), and Z = 8. It forms tabular, mostly isometric crystals, up to c. 0.5 mm across, typically in multiple intergrowths. The color is pale olive to khaki green and it has a greenish white to yellowish white streak. Crystals are transparent and have vitreous luster. The Mohs hardness is estimated to be between 2 and 3. Linekite is brittle with an uneven fracture and perfect cleavage on {100} and very good cleavage on {010}. It exhibits intense greenish yellow luminescence under both short-(254 nm) and long-wave (366 nm) UV radiation. The calculated density is 2.922 g/cm(3). The mineral is biaxial (+) with indices of refraction, alpha = 1.546(2), beta = 1.550, gamma = 1.562(2). The 2V(obs) is moderate; the calculated 2V is + 60 degrees. Optical orientation: Y = a, X = b, Z = c. The electron microprobe analyses (average of 28) provided: Na2O 0.06, K2O 6.89, CaO 14.11, CuO 0.12, UO3 48.76, CO2 * 22.51, H2O* 12.20 (similar to 12.9 from TG) (*calculated), total 104.65 wt%. The empirical formula (based on 30.22 O apfu) is: (K1.73Na0.02)(Sigma 1.75)(Ca2.97Cu0.02)(Sigma 2.99)[(UO2)(CO3)(3)](2.02)(H2O)(8.00). The Raman and infrared spectra exhibit prominent features consistent with the mineral being a hydrated uranyl tricarbonate, with fundamental vibrations of H2O molecules, CO(3)(2-)anions and UO22+ ions. The seven strongest powder X-ray diffraction lines are [d(obs) in angstrom (hkl) I-rel]: 8.627 (200) 100, 6.436 (022) 60, 5.935 (212) 11, 5.153 (222) 43, 4.592 (004) 19, 4.505 (040) 12 and 4.053 (204) 15. The structure of linekite was refined from single-crystal X-ray data to R = 0.034 for 4468 unique observed reflections (I-obs > 3 sigma I). The structure consists of prominent (Ca(H2O)(2)[(UO2)(CO3)(3)])(2-) layers parallel to (100), which define a square grid, leading to a strong tetragonal pseudosymmetry of linekite. Between the layers, disordered K+ cations and H2O molecules are localized. The structure is closely related to other uranyl tricarbonate minerals, e.g., albrechtschraufite and andersonite, due to the presence of a very characteristic paddle-wheel motif, Ca[(UO2)(CO3)(3)](4) Ca.
ER  -

PLÁŠIL, Jakub, Jiří ČEJKA, Jiří SEJKORA, Jan HLOUŠEK, Radek ŠKODA, Milan NOVÁK, Michal DUŠEK, Ivana CISAROVA, Ivan NEMEC and Jana EDEROVA. Linekite, K2Ca3[(UO2)(CO3)(3)](2)center dot 8H(2)O, a new uranyl carbonate mineral from Jachymov, Czech Republic. \textit{Journal of Geosciences}. Praha: Česká geologická společnost, 2017, vol.~62, No~3, p.~201-213. ISSN~1802-6222. Available from: https://dx.doi.org/10.3190/jgeosci.241.

Detailed Information on Publication Record