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Scenicite, a new uranyl-sulfate mineral from the White Canyon district, San Juan County, Utah, USA

Kampf, Anthony R. and Plášil, Jakub and Olds, Travis A. and Ma, Chi and Marty, Joe (2022) Scenicite, a new uranyl-sulfate mineral from the White Canyon district, San Juan County, Utah, USA. Mineralogical Magazine, 86 (5). pp. 743-748. ISSN 0026-461X. doi:10.1180/mgm.2022.53.

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The new mineral scenicite (IMA2021-057), [(UO₂)(H₂O)₂(SO₄)]₂⋅3H₂O, was found in the Green Lizard, Giveaway–Simplot, Markey and Scenic mines, White Canyon district, San Juan County, Utah, USA, where it occurs as a secondary phase on granular quartz matrix in association with various combinations of deliensite, gypsum, natrozippeite, rietveldite and shumwayite. Scenicite crystals are transparent, light green yellow, poorly formed blades or prisms, up to 0.1 mm in length. The mineral has white streak and vitreous lustre. It exhibits bright greenish-white fluorescence (405 nm laser). It is brittle with irregular, curved fracture and a Mohs hardness of ~2. It has excellent {100} and good {001} cleavages. The calculated density is 3.497 g cm⁻³. Optically, the mineral is biaxial (–) with α = 1.556(2), β = 1.573(2), γ = 1.576(2) (white light); 2V = 45(3)°; extreme r v dispersion; orientation: X = c, Y = a, Z = b; pleochroism: X and Y = colourless, Z = light green–yellow; and X = Y Z. The Raman spectrum exhibits bands consistent with UO₂²⁺, SO₄²⁻ and O–H. Electron microprobe analysis provided the empirical formula U_(1.996)S_(2.005)O_(19)H_(13.997). The five strongest powder X-ray diffraction lines are [d_(obs) Å(I)(hkl)]: 7.69(70)(201), 5.63(100)(111), 4.92(84)(202,310), 4.80(93)(401) and 3.398(55)(020,120,511,601). Scenicite is orthorhombic, Pca2₁, a = 21.2144(15), b = 6.8188(3) c = 11.2554(6) Å, V = 1628.18(16) ų and Z = 4. In the structure of scenicite (R₁ = 0.0365 for 1259 I > 2σI), linkages of pentagonal bipyramids and tetrahedra form an infinite neutral [(UO₂)(SO₄)(H₂O)₂] chain. The structure of shumwayite contains topologically identical chains.

Item Type:Article
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URLURL TypeDescription
Kampf, Anthony R.0000-0001-8084-2563
Plášil, Jakub0000-0001-6627-5742
Olds, Travis A.0000-0001-5333-0802
Ma, Chi0000-0002-1828-7033
Additional Information:© The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland. (Received 11 April 2022; accepted 18 May 2022; Accepted Manuscript published online: 30 May 2022; Associate Editor: Oleg I Siidra) Fernando Camara and an anonymous reviewer are thanked for their comments on the manuscript. A portion of this study was funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County. This research was also financially supported by the Czech Science Foundation (project 20-11949S to JP). Competing interests: The authors declare none.
Funding AgencyGrant Number
John Jago Trelawney EndowmentUNSPECIFIED
Czech Science Foundation20-11949S
Subject Keywords:scenicite; new mineral; uranyl sulfate; crystal structure; Raman spectroscopy; Green Lizard mine; Scenic mine; White Canyon district; Utah; USA
Issue or Number:5
Record Number:CaltechAUTHORS:20220808-886776000
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Official Citation:Kampf, A., Plášil, J., Olds, T., Ma, C., & Marty, J. (2022). Scenicite, a new uranyl-sulfate mineral from the White Canyon district, San Juan County, Utah, USA. Mineralogical Magazine, 86(5), 743-748. doi:10.1180/mgm.2022.53
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116174
Deposited By: George Porter
Deposited On:11 Aug 2022 22:56
Last Modified:11 Nov 2022 22:51

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