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Olgafrankite
A valid IMA mineral species
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Formula:
Ni3Ge
Lustre:
Metallic
Hardness:
5½
Specific Gravity:
8.927 (Calculated)
Crystal System:
Isometric
Name:
The new mineral was named olgafrankite (Russian Cyrillic: ольгафранкит), in honor of Professor Olga Victorovna Frank Kamenetskaya (b. 1945; Russian Cyrillic: Ольга Викторовна Франк-Каменецкая), a distinguished specialist in the crystal chemistry of minerals, biomineralogy, and the ecology of cultural monuments.
Some properties measured from synthetic material.
Unique Identifiers
Mindat ID:
471484
Long-form identifier:
mindat:1:1:471484:8
IMA Classification of Olgafrankite
Approved
Approval year:
2024
Type description reference:
Vereshchagin, Oleg S.; Khmelnitskaya, Maya O.; Kopylova, Albina G.; Solov’eva, Yulia V.; Krzhizhanovskaya, Maria G.; Kasatkin, Anatoly V.; Gorelova, Liudmila A.; Vlasenko, Natalia S.; Britvin, Sergey N. (2025) Olgafrankite, Ni3Ge, a new mineral, the carrier of siderophile germanium in reduced systems. American Mineralogist, 110 (10). 1640-1648 doi:10.2138/am-2024-9714
Classification of Olgafrankite
2.AB.10a
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
B : Ni-metalloid alloys
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
B : Ni-metalloid alloys
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ofk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Olgafrankite
Metallic
Transparency:
Opaque
Streak:
Silver
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven
Density:
8.927(1) g/cm3 (Calculated)
Optical Data of Olgafrankite
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 470nm | 43.3% |
| 546nm | 51.8% |
| 589nm | 51.8% |
| 650nm | 59.7% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 59.7%.
Colour in reflected light:
bright white with pink tint
Internal Reflections:
none
Chemistry of Olgafrankite
Mindat Formula:
Ni3Ge
Elements listed:
Crystallography of Olgafrankite
Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Pm3m
Setting:
Pm3m
Cell Parameters:
a = 3.5784(2) Å
Unit Cell V:
45.82 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.066 Å | (100) |
| 1.789 Å | (38) |
| 1.265 Å | (15) |
| 1.079 Å | (20) |
| 1.033 Å | (5) |
Reference:
Vereshchagin, Oleg S.; Khmelnitskaya, Maya O.; Kopylova, Albina G.; Solov’eva, Yulia V.; Krzhizhanovskaya, Maria G.; Kasatkin, Anatoly V.; Gorelova, Liudmila A.; Vlasenko, Natalia S.; Britvin, Sergey N. (2025) Olgafrankite, Ni3Ge, a new mineral, the carrier of siderophile germanium in reduced systems. American Mineralogist, 110 (10). 1640-1648 doi:10.2138/am-2024-9714
Type Occurrence of Olgafrankite
General Appearance of Type Material:
individual olgafrankite crystal cross-sections are 5 × 7 μm.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineralogical Museum, Department of Mineralogy, St. Petersburg State University, Universitetskaya Emb. 7/9, 199034 St. Petersburg, Russia, catalogue number 1/20138 (holotype), and the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration number 6156/1 (anthropotype)
Geological Setting of Type Material:
Native iron forms compact accumulations as nodules (3-60 cm) in gabbrodolerite and as fine dissemination in microdolerite.
Associated Minerals at Type Locality:
Reference:
Vereshchagin, Oleg S.; Khmelnitskaya, Maya O.; Kopylova, Albina G.; Solov’eva, Yulia V.; Krzhizhanovskaya, Maria G.; Kasatkin, Anatoly V.; Gorelova, Liudmila A.; Vlasenko, Natalia S.; Britvin, Sergey N. (2025) Olgafrankite, Ni3Ge, a new mineral, the carrier of siderophile germanium in reduced systems. American Mineralogist, 110 (10). 1640-1648 doi:10.2138/am-2024-9714
Synonyms of Olgafrankite
Other Language Names for Olgafrankite
Dutch:Olgafrankiet
German:Olgafrankit
Relationship of Olgafrankite to other Species
Other Members of Auricupride Subgroup:
| Auricupride | Cu3Au | Iso. m3m(4/m32/m) : Pm3m |
| Cuproauride | Cu3Au |
Related Minerals - Strunz-mindat Grouping
| 2.AB.10 | Orcelite | Ni5-xAs2, x ~ 0.25 |
| 2.AB.15 | Maucherite | Ni11As8 |
Fluorescence of Olgafrankite
none
Other Information
Magnetism:
Non-Magnetic
Notes:
insoluble in 10 % HCl
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 Olgafrankite
mindat.org URL:
https://www.mindat.org/min-471484.html
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References for Olgafrankite
Reference List:
Vereshchagin, O. S., Khmelnitskaya, M. O., Kopylova, A. G., Solov'eva, Y. V., Krzhizhanovskaya, M. G, Kasatkin, A. V., Gorelova, L. A., Vlasenko, N. S., Britvin, S. N. (2024) Olgafrankite, IMA 2024-048, in IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 82. European Journal of Mineralogy, 36 (6). 1005-1010 doi:10.5194/ejm-36-1005-2024
Vereshchagin, Oleg S.; Khmelnitskaya, Maya O.; Kopylova, Albina G.; Solov’eva, Yulia V.; Krzhizhanovskaya, Maria G.; Kasatkin, Anatoly V.; Gorelova, Liudmila A.; Vlasenko, Natalia S.; Britvin, Sergey N. (2025) Olgafrankite, Ni3Ge, a new mineral, the carrier of siderophile germanium in reduced systems. American Mineralogist, 110 (10). 1640-1648 doi:10.2138/am-2024-9714
Localities for Olgafrankite
Showing 1 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.
Russia (TL) | |
| Vereshchagin et al. (2024) +1 other reference |
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