Informace o publikaci

Paramarkeyite, a new calcium-uranyl-carbonate mineral from the Markey mine, San Juan County, Utah, USA

Logo poskytovatele
Autoři

KAMPF Anthony R. OLDS Travis A. PLÁŠIL Jakub BURNS Peter C. ŠKODA Radek MARTY Joe

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj Mineralogical Magazine
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://pubs.geoscienceworld.org/minmag/article-abstract/86/1/27/612393/Paramarkeyite-a-new-calcium-uranyl-carbonate
Doi http://dx.doi.org/10.1180/mgm.2021.100
Klíčová slova paramarkeyite; new mineral; uranyl tricarbonate; crystal structure; markeyite; natromarkeyite; pseudomarkeyite; Markey mine; Utah; USA
Popis The new mineral paramarkeyite (IMA2021-024), Ca-2(UO2)(CO3)(3).5H(2)O, was found in the Markey mine, San Juan County, Utah, USA, where it occurs as a secondary phase on gypsum-coated asphaltum in association with andersonite, calcite, gypsum and natromarkeyite. Paramarkeyite crystals are transparent, pale green-yellow, striated tablets, up to 0.11 mm across. The mineral has white streak and vitreous lustre. It exhibits moderate bluish-white fluorescence (405 nm laser). It is very brittle with irregular, curved fracture and a Mohs hardness of 21/2. It has an excellent {100} cleavage and probably two good cleavages on {010} and {001}. The measured density is 2.91(2) g cm(-3). Optically, the mineral is biaxial (-) with alpha = 1.550(2), beta = 1.556(2), gamma = 1.558(2) (white light); 2V = 60(2)degrees; strong r > v dispersion; orientation: Y = b; nonpleochroic. The Raman spectrum exhibits bands consistent with UO22+, CO32- and O-H. Electron microprobe analysis provided the empirical formula (Ca1.83Na0.20Sr0.03)(sigma 2.05)(UO2)(CO3)(3).5H(2)O (+0.07 H). Paramarkeyite is monoclinic, P2(1)/n, a = 17.9507(7), b = 18.1030(8), c = 18.3688(13) angstrom, beta = 108.029(8)degrees, V = 5676.1(6) angstrom(3) and Z = 16. The structure of paramarkeyite (R-1 = 0.0647 for 6657 I > 2 sigma I) contains uranyl tricarbonate clusters that are linked by Ca-O polyhedra to form heteropolyhedral layers. The structure of paramarkeyite is very similar to those of markeyite, natromarkeyite and pseudomarkeyite.
Související projekty:

Používáte starou verzi internetového prohlížeče. Doporučujeme aktualizovat Váš prohlížeč na nejnovější verzi.

Další info