Marathonite
A valid IMA mineral species
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Formula:
Pd25Ge9
Lustre:
Metallic
Specific Gravity:
10.933 (Calculated)
Crystal System:
Trigonal
Name:
The name is for the town of Marathon, Ontario, Canada, after which the Marathon deposit (Coldwell complex) is named.
The first germanide mineral to be discovered and approved (compare palladogermanide). Unique combination of elements (among approved species). New structure type.
Stable in the 550–970 °C range. Probably a physical and/or chemical alteration phase.
Formed at 500–600 °C, under low fS2 and fO2, form Ge-dominant minerals.
Stable in the 550–970 °C range. Probably a physical and/or chemical alteration phase.
Formed at 500–600 °C, under low fS2 and fO2, form Ge-dominant minerals.
Unique Identifiers
Mindat ID:
50772
Long-form identifier:
mindat:1:1:50772:1
IMA Classification of Marathonite
Approved
Approval year:
2016
Classification of Marathonite
1.B0.05
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides, Phosphides and Hydrides
0 :
1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides, Phosphides and Hydrides
0 :
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mth | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mth | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Pronunciation of Marathonite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Marathonite
Metallic
Transparency:
Opaque
Streak:
Couldn't be measured
Comment:
microhardness couldn't be measured
Density:
10.933 g/cm3 (Calculated)
Chemistry of Marathonite
Mindat Formula:
Pd25Ge9
Elements listed:
Crystallography of Marathonite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 7.391(1) Å, c = 10.477(2) Å
Ratio:
a:c = 1 : 1.418
Unit Cell V:
495.65 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.748 Å | (10) |
| 2.436 Å | (10) |
| 2.374 Å | (29) |
| 2.148 Å | (100) |
| 1.759 Å | (10) |
| 1.360 Å | (13) |
| 1.239 Å | (14) |
| 1.207 Å | (10) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 37 : Layered igneous intrusions and related PGE minerals |
Type Occurrence of Marathonite
General Appearance of Type Material:
Rounded, elongated grains, up to 33 × 48 μm in size
Place of Conservation of Type Material:
Mineralogical collections of the Canadian Museum of Nature, Gatineau, Quebec, Canada (catalogue number CMNMC 87179)
Associated Minerals at Type Locality:
Synonyms of Marathonite
Other Language Names for Marathonite
Dutch:Marathoniet
German:Marathonit
Related Minerals - Strunz-mindat Grouping
| 1.B0. | Wenjiite | Ti10SixPy |
| 1.B0.05 | Jingsuiite | TiB2 |
| 1.B0.10 | Palladogermanide | Pd2Ge |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Marathonite
mindat.org URL:
https://www.mindat.org/min-50772.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Marathonite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter No 34. Mineralogical Magazine, 80 (7) 1315-1321 doi:10.1180/minmag.2016.080.086
McDonald, Andrew M., Ames, Doreen E., Kjarsgaard, Ingrid M., Cabri, Louis J., Zhe, William, Ross, Kirk C., Good, David J. (2021) Marathonite, Pd25Ge9, and palladogermanide, Pd2Ge, two new platinum-group minerals from the Marathon deposit, Coldwell Complex, Ontario, Canada: Descriptions, crystal-chemical considerations, and genetic implications. The Canadian Mineralogist, 59 (6) 1865-1886 doi:10.3749/canmin.2100022
Localities for Marathonite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
| Hålenius et al. (2016) +1 other reference |
Finland | |
| Järvinen et al. (2019) |
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