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Hagstromite, Pb (sub 8) Cu (super 2+) (Te (super 6) +O (sub 6) ) (sub 2) (CO (sub 3) )Cl (sub 4) , a new lead-tellurium oxysalt mineral from Otto Mountain, California, USA

Anthony R. Kampf, Robert M. Housley, Stuart J. Mills, George R. Rossman and Joe Marty
Hagstromite, Pb (sub 8) Cu (super 2+) (Te (super 6) +O (sub 6) ) (sub 2) (CO (sub 3) )Cl (sub 4) , a new lead-tellurium oxysalt mineral from Otto Mountain, California, USA
Mineralogical Magazine (August 2020) 84 (4): 517-523

Abstract

Hagstromite, Pb (sub 8) Cu (super 2+) (Te (super 6+) O (sub 6) ) (sub 2) (CO (sub 3) )Cl (sub 4) , (IMA2019-093) is a new tellurate mineral from Otto Mountain near Baker, California, USA. It occurs on quartz in association with cerussite, fuettererite and thorneite. It is a secondary oxidation zone mineral and is presumed to have formed by oxidation of earlier formed tellurides, chalcopyrite and galena. Hagstromite occurs as light yellow-green blades, up to approximately 100 mu m long. Crystals are transparent with adamantine to silky lustre. The mineral is brittle with two cleavages providing splintery fracture; the Mohs hardness is probably between 2 and 3. The calculated density is 7.062 g cm-3. Hagstromite is optically biaxial (+), with calculated indices of refraction for alpha =2.045, beta =2.066 and gamma =2.102; 2Vmeas=76(1) degrees ; and optical orientation X=b, Y=a and Z=c. The Raman spectrum of hagstromite exhibits similarities with those of agaite and thorneite and confirms the presence of CO (sub 3) (super 2-) . The electron microprobe analyses provided the empirical formula Pb (sub 8.07) Cu (super 2+) (sub 0.98) Te (super 6+) (sub 1.96) C (sub 1.17) Cl (sub 3.83) O (sub 15.34) . Hagstromite is orthorhombic, space group Ibam, with a=23.688(17), b=9.026(8), c=10.461(8) Aa, V=2237(3) Aa (super 3) and Z=4. The crystal structure of hagstromite (R1=0.0659 for 284 I>2sigma I reflections) contains a novel Cu (super 2+) Te (super 6+) (sub 2) O (sub 12) chain assembled of corner-sharing Cu (super 2+) O (sub 4) squares and Te (super 6+) O (sub 6) octahedra. The O atoms in the chains form bonds with Pb (super 2+) cations, which in turn bond to Cl (super -) and CO (sub 3) (super 2-) anions, thereby creating a framework structure.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 84
Serial Issue: 4
Title: Hagstromite, Pb (sub 8) Cu (super 2+) (Te (super 6) +O (sub 6) ) (sub 2) (CO (sub 3) )Cl (sub 4) , a new lead-tellurium oxysalt mineral from Otto Mountain, California, USA
Affiliation: Natural History Museum of Los Angeles County, Mineral Sciences Department, Los Angeles, CA, United States
Pages: 517-523
Published: 202008
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 22
Accession Number: 2020-080751
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N34°00'00" - N35°45'00", W117°40'00" - W114°15'00"
Secondary Affiliation: California Institute of Technology, USA, United StatesMuseums Victoria, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
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