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Flaggite, Pb₄Cu²⁺₄Te⁶⁺₂(SO₄)₂O₁₁(OH)₂(H₂O), a new mineral with stair-step-like HCP layers from Tombstone, Arizona, USA

Kampf, Anthony R. and Mills, Stuart J. and Celestian, Aaron J. and Ma, Chi and Yang, Hexiong and Thorne, Brent (2022) Flaggite, Pb₄Cu²⁺₄Te⁶⁺₂(SO₄)₂O₁₁(OH)₂(H₂O), a new mineral with stair-step-like HCP layers from Tombstone, Arizona, USA. Mineralogical Magazine, 86 (3). pp. 397-404. ISSN 0026-461X. doi:10.1180/mgm.2022.37. https://resolver.caltech.edu/CaltechAUTHORS:20220829-544792300

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Abstract

The new mineral flaggite (IMA2021-044), Pb4Cu2+4Te6+2(SO4)2O11(OH)2(H2O), occurs at the Grand Central mine in the Tombstone district, Cochise County, Arizona, USA, in cavities in quartz matrix in association with alunite, backite, cerussite, jarosite and rodalquilarite. Flaggite crystals are lime-green to yellow-green tablets, up to 0.5 mm across. The mineral has a very pale green streak and adamantine lustre. It is brittle with irregular fracture and a Mohs hardness of ~3. It has one excellent cleavage on {010}. The calculated density is 6.137 g cm–3. Optically, the mineral is biaxial (+) with α = 1.95(1), β = 1.96(1), γ = 2.00(1) (white light); 2V = 54(2)°; pleochroism: X green, Y light yellow green, Z nearly colourless; X > Y > Z. The Raman spectrum exhibits bands consistent with TeO6 and SO4. Electron microprobe analysis provided the empirical formula Pb3.88Cu2+3.89Te6+2.08(SO4)2O11(OH)2(H2O) (–0.03 H). Flaggite is triclinic, P1, a = 9.5610(2), b = 9.9755(2), c = 10.4449(3) Å, α = 74.884(1), β = 89.994(1), γ = 78.219(1)°, V = 939.97(4) Å3 and Z = 2. The structure of flaggite (R1 = 0.0342 for 5936 I > 2σI) contains hexagonal-close-packed, stair-step-like layers comprising TeO6 octahedra and Jahn-Teller distorted CuO6 octahedra. The layers in the structure of flaggite are very similar to those in bairdite, timroseite and paratimroseite.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1180/mgm.2022.37DOIArticle
ORCID:
AuthorORCID
Kampf, Anthony R.0000-0001-8084-2563
Ma, Chi0000-0002-1828-7033
Thorne, Brent0000-0001-8260-8922
Alternate Title:Flaggite, Pb4Cu2+4Te6+2(SO4)2O11(OH)2(H2O), a new mineral with stair-step-like HCP layers from Tombstone, Arizona, USA
Additional Information:Oleg Siidra, an anonymous reviewer and Structures Editor Peter Leverett are thanked for their constructive 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.
Funders:
Funding AgencyGrant Number
John Jago Trelawney EndowmentUNSPECIFIED
Issue or Number:3
DOI:10.1180/mgm.2022.37
Record Number:CaltechAUTHORS:20220829-544792300
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220829-544792300
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116602
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:31 Aug 2022 00:00
Last Modified:31 Aug 2022 00:00

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