CaltechAUTHORS
  A Caltech Library Service

Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb_3Te^(4+)O_4Cl_2, the Te analog of perite and nadorite

Kampf, Anthony R. and Mills, Stuart J. and Housley, Robert M. and Marty, Joseph and Thorne, Brent (2010) Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb_3Te^(4+)O_4Cl_2, the Te analog of perite and nadorite. American Mineralogist, 95 (10). pp. 1569-1573. ISSN 0003-004X. http://resolver.caltech.edu/CaltechAUTHORS:20101028-085429420

[img]
Preview
PDF - Published Version
See Usage Policy.

634Kb
[img] Plain Text - Supplemental Material
See Usage Policy.

14Kb
[img] MS Word - Supplemental Material
See Usage Policy.

35Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20101028-085429420

Abstract

Telluroperite, Pb_3Te^(4+)O_4Cl_2, is a new tellurite from Otto Mountain near Baker, California. The new mineral occurs on fracture surfaces and in small vugs in brecciated quartz veins in direct association with acanthite, bromine-rich chlorargyrite, caledonite, cerussite, galena, goethite, and linarite. Various other secondary minerals occur in the veins, including six new tellurates, housleyite, markcooperite, paratimroseite, ottoite, thorneite, and timroseite. Telluroperite is orthorhombic, space group Bmmb, a = 5.5649(6), b = 5.5565(6), c = 12.4750(14) Å, V = 386.37(7) Å^3, and Z = 2. The new mineral occurs as rounded square tablets and flakes up to 0.25 mm on edge and 0.02 mm thick. The form {001} is prominent and is probably bounded by {100}, {010}, and {110}. It is bluish-green and transparent, with a pale bluish-green streak and adamantine luster. The mineral is non-fluorescent. Mohs hardness is estimated to be between 2 and 3. The mineral is brittle, with a curved fracture and perfect {001} cleavage. The calculated density based on the empirical formula is 7.323 g/cm^3. Telluroperite is biaxial (–), with very small 2V (~10°). The average index of refraction is 2.219 calculated by the Gladstone-Dale relationship. The optical orientation is X = c and the mineral exhibits moderate bluish-green pleochrosim; absorption: X < Y = Z. Electron microprobe analysis provided PbO 72.70, TeO_2 19.26, Cl 9.44, O≡Cl –2.31, total 99.27 wt%. The empirical formula (based on O+Cl = 6) is Pb_(2.79)Te_(1.03)^(4+)O_(3.72)Cl_(2.28). The six strongest powder X-ray diffraction lines are [d_(obs) in Å (hkl) I]: 3.750 (111) 58, 2.857 (113) 100, 2.781 (020, 200) 43, 2.075 (024, 204) 31, 1.966 (220) 30, and 1.620 (117, 313, 133) 52. The crystal structure (R_1 = 0.056) is based on the Sillén X_1 structure-type and consists of a three-dimensional structural topology with lead-oxide halide polyhedra linked to tellurium/lead oxide groups. The mineral is named for the relationship to perite and the dominance of Te (with Pb) in the Bi site of perite.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.2138/am.2010.3515 DOIUNSPECIFIED
http://ammin.geoscienceworld.org/cgi/content/abstract/95/10/1569PublisherUNSPECIFIED
Additional Information:© 2010 Mineralogical Society of America. Manuscript received January 28, 2010. Manuscript accepted May 7, 2010. Manuscript handled by Ian Swainson. We thank Associate Editor Ian Swainson, referees Andrew Roberts and Pascal Grundler, and Technical Editor Ron Peterson for helpful comments on the manuscript. The microprobe analyses were supported by a grant to the California Institute of Technology from the Northern California Mineralogical Association. The remainder 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
Northern California Mineralogical Association UNSPECIFIED
John Jago Trelawney Endowment UNSPECIFIED
Subject Keywords:Telluroperite; new mineral; tellurite; crystal structure; perite; nadorite; Sillen X-1; Otto Mountain; California
Record Number:CaltechAUTHORS:20101028-085429420
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101028-085429420
Official Citation:Kampf, A. R., S. J. Mills, et al. (2010). "Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb3Te4+O4Cl2, the Te analog of perite and nadorite." American Mineralogist 95(10): 1569-1573. DOI: 10.2138/am.2010.3515
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20576
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Nov 2010 21:41
Last Modified:26 Dec 2012 12:34

Repository Staff Only: item control page