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Devitoite, a new heterophyllosilicate mineral with astrophyllite-like layers from eastern Fresno County, California

Kampf, Anthony R. and Rossman, George R. and Steele, Ian M. and Pluth, Joseph J. and Dunning, Gail E. and Walstrom, Robert E. (2010) Devitoite, a new heterophyllosilicate mineral with astrophyllite-like layers from eastern Fresno County, California. Canadian Mineralogist, 48 (1). pp. 29-40. ISSN 0008-4476. https://resolver.caltech.edu/CaltechAUTHORS:20100528-134407745

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Abstract

Devitoite, [Ba_6(PO_4)_2(CO_3)] [Fe^(2+)_7Fe^(3+)_2(Si_4O_(12))_2O_2(OH)_4], is a new mineral species from the Esquire #8 claim along Big Creek in eastern Fresno County, California, U.S.A. It is also found at the nearby Esquire #7 claim and at Trumbull Peak in Mariposa County. The mineral is named for Alfred (Fred) DeVito (1937–2004). Devitoite crystallized very late in a sequence of minerals resulting from fluids interacting with a quartz–sanbornite vein along its margin with the country rock. The mineral occurs in subparallel intergrowths of very thin brown blades, flattened on {001} and elongate and striated parallel to [100]. The mineral has a cream to pale brown streak, a silky luster, a Mohs hardness of approximately 4, and two cleavages: {001} perfect and {010} good. The calculated density is 4.044 g/cm^3. It is optically biaxial (+), α 1.730(3), β 1.735(6), γ 1.755(3); 2V_(calc) = 53.6°; orientation: X ≈ b, Y ≈ c, Z ≈ α; pleochroism: brown, Y >>> X > Z. Normalized electron-microprobe analyses provided: BaO 38.83, CaO 0.50, MgO 0.75, FeO 22.02, Fe_2O_3 6.08, Al_2O_3 1.50, SiO_2 20.97, TiO_2 0.80, P_2O_5 4.84, H_2O 1.67, CO_2 2.04, total 100.00 wt%, with FeO and Fe_2O_3 assignments and H_2O and CO_2 based on the structure. The empirical formula is [(Ba_(5.45) Ca_(0.19))_(∑5.64)(PO_4)_(1.47)O_(0.30)(CO_3)] [(Fe^(2+)_(6.60)Mg_(0.40))_(∑7)(Fe^(3+)_(1.64)Ti^(4+)_(0.22)Al^(3+)0.14)_(∑2)(Si_(7.51)Al_(0.49))_(∑8)O_(26)(OH)_4]. Devitoite is triclinic, Pl, α 5.3437(7), b 11.6726(15), c 14.680(2) Å, α91.337(4), β 96.757(4), y 103.233(4)°, V 884.0(2) Å^3 and Z = 1. The crystal-structure determination (R_1 = 9.56% for 1370 F_o > 4σF) shows the mineral to be a heterophyllosilicate with astrophyllite-type HOH layers in which five-coordinated Fe^(3+) takes the place of Ti^(4+). The interlayer region contains Ba atoms, PO_4 groups and CO_3 groups. The configuration of the Ba and PO_4 in the interlayer region is similar to that found in the structure of yoshimuraite.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3749/canmin.48.1.29DOIUNSPECIFIED
http://canmin.geoscienceworld.org/cgi/content/abstract/48/1/29PublisherUNSPECIFIED
ORCID:
AuthorORCID
Kampf, Anthony R.0000-0001-8084-2563
Rossman, George R.0000-0002-4571-6884
Additional Information:© 2010 by the GeoScienceWorld. Received November 30, 2009, revised manuscript accepted February 9, 2010. Fernando Cámara, Elena Sokolova, Andrew M. McDonald and Stuart J. Mills provided helpful comments on the manuscript. Portions of this study were funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County (ARK) and by the White Rose Foundation (GRR). Portions of this work were completed at ChemMatCARS (Sector 15) and GeoSoilEnviroCARS (Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. ChemMatCARS is principally supported by the National Science Foundation and the Department of Energy under grant number NSF/CHE–0822838. GeoSoilEnviroCARS is supported by the National Science Foundation – Earth Sciences (EAR–0622171) and Department of Energy – Geosciences (DE–FG02–94ER14466). Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE–AC02–06CH11357
Funders:
Funding AgencyGrant Number
John Jago Trelawney EndowmentUNSPECIFIED
Mineral Sciences Department of the Natural History Museum of Los Angeles County (ARK)UNSPECIFIED
White Rose FoundationUNSPECIFIED
NSF/Department of EnergyNSF/CHE–0822838
NSF/Earth SciencesEAR–0622171
Department of Energy/GeosciencesDE–FG02–94ER14466
Department of Energy, Office of ScienceUNSPECIFIED
Office of Basic Energy SciencesDE–AC02–06CH11357
Subject Keywords:devitoite, new mineral species, crystal structure, heterophyllosilicate, astrophyllite layers, Big Creek – Rush Creek sanbornite deposits, California.
Issue or Number:1
Record Number:CaltechAUTHORS:20100528-134407745
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100528-134407745
Official Citation:Anthony R. Kampf, George R. Rossman, Ian M. Steele, Joseph J. Pluth, Gail E. Dunning, and Robert E. Walstrom Devitoite, a new heterophyllosilicate mineral with astrophyllite-like layers from eastern Fresno County, California The Canadian Mineralogist (February 2010), 48(1):29-40
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18498
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:30 Jun 2010 19:53
Last Modified:09 Mar 2020 13:18

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