Coldwellite, ideally Pd3Ag2S, is a new mineral species discovered in a heavy-mineral concentrate from the Marathon deposit, Coldwell Complex, Ontario Canada. It is cubic, crystallizing in space group P4332 (#212) with a 7.2470(8) Å, V 380.61(1) Å3, Z = 4. The five strongest lines of the X-ray powder-diffraction pattern [d in Å (I)(hkl)] are: 2.427(100)(221), 2.302(38)(310), 2.195(38)(311), 1.4280(44)(510,431), 0.9294(24)(650,643), and 0.9208(20)(732,651). Associated minerals in the discovery sample include Au-Ag alloy, hollingworthite, isoferroplatinum, keithconnite, kotulskite, mertieite-II, michenerite, palladoarsenide, sobolevskite, sperrylite, stillwaterite, vysotskite, Ti- and Cr-rich magnetite and ilmenite, pyrrhotite, chalcopyrite, and pentlandite, with trace amounts of bornite, cobaltite, and galena. Coldwellite is white with a light pinkish brown tint, and it has a metallic luster. No streak or microhardness could be measured. The mineral shows no internal reflections, pleochroism, bireflectance, or anisotropy. The reflectance values (%) in air for the standard COM wavelengths are: 41.9 (470 nm), 44.9 (546 nm), 44.0 (589 nm), and 45.0 (650 nm). The density, 9.90(1) g/cm3, was calculated using the empirical formula and the unit-cell parameters from the refined crystal-structure. The average result (n = 23) of electron-microprobe analyses is: Pd 56.1, Fe 0.16, Ag 38.2, S 5.63, total 100.09 wt.%, which corresponds to (Pd2.99Fe0.02)∑3.01Ag2.00S0.99, based on 6 apfu. The name recalls the type locality.
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Research Article|
September 01, 2015
Coldwellite, Pd3Ag2S, a New Mineral Species from the Marathon Deposit, Coldwell Complex, Ontario, Canada
Andrew M. McDonald;
Andrew M. McDonald
*
Department of Earth Sciences, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6, Canada
*E-mail address:[email protected]
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Louis J. Cabri;
Louis J. Cabri
Cabri Consulting Inc., 700-702 Bank Street, PO Box 14087, Ottawa, Ontario K1S 3V0, Canada
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Chris J. Stanley;
Chris J. Stanley
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom
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David J. Good;
David J. Good
Department of Earth Sciences, University of Western Ontario, London, Ontario N5A 5B7, Canada
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Jason Redpath;
Jason Redpath
Process Mineralogical Consulting Inc., 10630 240th Street, Maple Ridge, British Columbia V2W 2B2, Canada
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Geoff Lane;
Geoff Lane
Process Mineralogical Consulting Inc., 10630 240th Street, Maple Ridge, British Columbia V2W 2B2, Canada
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John Spratt;
John Spratt
Core Research Laboratories, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom
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Doreen E. Ames
Doreen E. Ames
Geological Survey of Canada, 750-601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
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Andrew M. McDonald
*
Department of Earth Sciences, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6, Canada
Louis J. Cabri
Cabri Consulting Inc., 700-702 Bank Street, PO Box 14087, Ottawa, Ontario K1S 3V0, Canada
Chris J. Stanley
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom
David J. Good
Department of Earth Sciences, University of Western Ontario, London, Ontario N5A 5B7, Canada
Jason Redpath
Process Mineralogical Consulting Inc., 10630 240th Street, Maple Ridge, British Columbia V2W 2B2, Canada
Geoff Lane
Process Mineralogical Consulting Inc., 10630 240th Street, Maple Ridge, British Columbia V2W 2B2, Canada
John Spratt
Core Research Laboratories, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom
Doreen E. Ames
Geological Survey of Canada, 750-601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
*E-mail address:[email protected]
Publisher: Mineralogical Association of Canada
Received:
16 Feb 2015
Accepted:
15 Jul 2015
First Online:
20 Nov 2017
Online ISSN: 1499-1276
Print ISSN: 0008-4476
Copyright 2015, Mineralogical Association of Canada
The Canadian Mineralogist (2015) 53 (5): 845–857.
Article history
Received:
16 Feb 2015
Accepted:
15 Jul 2015
First Online:
20 Nov 2017
Citation
Andrew M. McDonald, Louis J. Cabri, Chris J. Stanley, David J. Good, Jason Redpath, Geoff Lane, John Spratt, Doreen E. Ames; Coldwellite, Pd3Ag2S, a New Mineral Species from the Marathon Deposit, Coldwell Complex, Ontario, Canada. The Canadian Mineralogist 2015;; 53 (5): 845–857. doi: https://doi.org/10.3749/canmin.1500020
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Index Terms/Descriptors
- arsenides
- bismuthides
- Canada
- chemical composition
- coexisting minerals
- Coldwell Complex
- crystal chemistry
- crystal structure
- Eastern Canada
- electron probe data
- formula
- lattice parameters
- metals
- michenerite
- new minerals
- Ontario
- optical properties
- palladium
- platinum group
- platinum minerals
- reflectance
- silver
- space groups
- sperrylite
- sulfides
- unit cell
- X-ray diffraction data
- kotulskite
- Marathon Deposit
- keithconnite
- isoferroplatinum
- hollingworthite
- palladoarsenide
- mertieite
- stillwaterite
- sobolevskite
- vysotskite
- coldwellite
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