IMA 2021-105 = shinarumpite

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
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IMA 2021-105 = shinarumpite

Messaggio da Marco E. Ciriotti » lun 28 nov, 2022 11:33

Prossima pubblicazione.

Referenza:
▪ Kampf, A.R., Plášil, J., Olds, T.A., Ma, C., Marty, J. (2023): Shinarumpite, a new cobalt uranyl sulfate mineral from the Scenic mine, San Juan County, Utah, USA, structurally related to leydetite. Mineralogical Magazine, 87, (in press).

Abstract:
The new mineral shinarumpite (IMA2021–105), [Co(H2O)6][(UO2)(SO4)2(H2O)]·4H2O, was found in the Scenic mine on Fry Mesa, White Canyon district, San Juan County,Utah, USA, where it occurs as a secondary phase on granular quartz matrix in association with gypsum, deliensite, Co-rich rietveldite, scenicite, shumwayite and sulfur. Shinarumpite crystals are transparent, yellow, blades or prisms, up to 1 mm in length. The mineral has white streak, vitreous lustre and is nonfluorescent. It is brittle with irregular, curved fracture. The Mohs hardness is ~2½ and it has a perfect {100} cleavage. The density is 2.58(2) g cm–3. Optically, the mineral is biaxial (–) with α = 1.515(2), β = 1.526(2), γ = 1.529(2) (white light); 2V = 55(1)°; extreme r < v dispersion; orientation: Z = b, X ^ a = 30° in obtuse β; pleochroism: X very pale yellow, Y pale yellow, Z light yellow; X < Y < Z. The Raman spectrum exhibits bands consistent with UO22+, SO42– and O–H. Electron microprobe analysis provided the empirical formula [(Co0.51Ni0.28Fe0.21)∑1.00(H2O)6][(UO2)(SO4)2(H2O)]·4H2O. The five strongest X-ray powder diffraction lines are [dobs Å(I)(hkl)]: 10.37(100)(200), 5.73(43)(111), 5.20(70)(400,202,211), 4.70(31)(-311) and 3.326(30)(213,021). Shinarumpite is monoclinic, P21/c, a = 21.0549(15), b = 6.8708(5), c = 12.9106(5), β = 96.678(7)°, V = 1885.03(17) Å3 and Z = 4. In the structure of shinarumpite (R1 = 0.0336 for 2623 I > 2I), linkages of pentagonal bipyramids and tetrahedra form an infinite [(UO2)(SO4)2(H2O)]2-sheet. Isolated Co(H2O)6 octahedra and H2O groups occupy the interlayer region linking the sheets via an extensive system of hydrogen bonds. The structure of shinarumpite is very similar to that of leydetite. Uranyl sulfate structural unit types are discussed with respect to frequency and charge deficiency per anion (CDA).

NdR: readily soluble in room-temperature H2O.

leydetite group
Geschieberite K2(UO2)(SO4)2∙2H2O orth Pna21 13.7778 7.2709 11.5488 90.00 90.00 90.00 4 1156.924
Leydetite Fe2+(UO2)(SO4)2·11H2O mon C2/c 11.3203 7.7293 21.8145 90.00 102.402 90.00 4 1864.18
Magnesioleydetite Mg(UO2)(SO4)2·11H2O mon C2/c 11.3513 7.7310 21.7957 90.00 102.387 90.00 4 1868.19
Shinarumpite [Co(H2O)6][(UO2)(SO4)2(H2O)]·4H2O mon P21/c 21.0549 6.8708 12.9106 90.00 96.678 90.00 4 1855.036
Straßmannite Al(UO2)(SO4)2F·16H2O mon C2/c 11.0187 8.3284 26.6727 90.00 97.426 90.00 4 2427.2
Wetherillite Na2Mg(UO2)2(SO4)4·18H2O mon P21/c 20.367 6.8329 12.903 90.00 107.879 90.00 2 1709

Vey interesting to note that any uranyl solfate minerals have a frameworks structure.
7 clusters; 15 chains; 19 sheets (metauranopilite and jáchymovite are not included due to the lack of structure information).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2021-105 = shinarumpite

Messaggio da Marco E. Ciriotti » gio 06 lug, 2023 10:22

Pubblicazione effettuata.

Referenza:
▪ Kampf, A.R., Plášil, J., Olds, T.A., Ma, C., Marty, J. (2023): Shinarumpite, a new cobalt uranyl sulfate mineral from the Scenic mine, San Juan County, Utah, USA, structurally related to leydetite. Mineralogical Magazine, 87, 348-355.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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