Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Sb (super 5+) and Sb (super 3+) substitution in segnitite; a new sink for As and Sb in the environment and implications for acid mine drainage

Stuart J. Mills, Barbara Etschmann, Anthony R. Kampf, Glenn Poirier and Matthew Newville
Sb (super 5+) and Sb (super 3+) substitution in segnitite; a new sink for As and Sb in the environment and implications for acid mine drainage
American Mineralogist (July 2014) 99 (7): 1355-1359

Abstract

A sample of Sb-rich segnitite from the Black Pine mine, Montana, U.S.A., has been studied by microprobe analyses, single-crystal X-ray diffraction, and mu -EXAFS and XANES spectroscopy. Linear combination fitting of the spectroscopic data provided Sb (super 5+) :Sb (super 3+) = 85(2):15(2), where Sb (super 5+) is in octahedral coordination substituting for Fe (super 3+) and Sb (super 3+) is in tetrahedral coordination substituting for As (super 5+) . Based upon this Sb (super 5+) :Sb (super 3+) ratio, the microprobe analyses yielded the empirical formula Pb (sub 1.02) H (sub 1.02) (Fe (super 3+) (sub 2.36) Sb (super 5+) (sub 0.41) Cu (super 2+) (sub 0.27) ) (sub Sigma 3.04) (As (super 5+ ) (sub 1.78) Sb (super 3+) (sub 0.07) S (super 6+) (sub 0.02) ) (sub Sigma 1.88) O (sub 8) (OH) (sub 6.00) . The crystal structure refinement and bond valence analysis are consistent with these cation site assignments. The formation of Sb-rich segnitite opens new possibilities for Sb sinks within the supergene zone. Segnitite may, in fact, be an ideal host for the sequestering of several toxic elements for pH < 2. At higher pH values, As is more likely to be incorporated into schwertmannite and ferrihydrite.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 7
Title: Sb (super 5+) and Sb (super 3+) substitution in segnitite; a new sink for As and Sb in the environment and implications for acid mine drainage
Affiliation: Museum Victoria, Geosciences, Melbourne, Victoria, Australia
Pages: 1355-1359
Published: 201407
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 48
Accession Number: 2014-058170
Categories: Mineralogy of non-silicatesEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N45°55'00" - N46°49'60", W113°49'60" - W113°02'60"
Secondary Affiliation: South Australian Museum, AUS, AustraliaNatural History Museum of Los Angeles County, USA, United StatesCanadian Museum of Nature, CAN, CanadaArgonne National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201431
Close Modal

or Create an Account

Close Modal
Close Modal