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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.


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Unique IdentifiersHide

Mindat ID:
471484
Long-form identifier:
mindat:1:1:471484:8

IMA Classification of OlgafrankiteHide

Classification of OlgafrankiteHide

Strunz-mindat (2026):
2.AB.10a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
B : Ni-metalloid alloys

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
OfkIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of OlgafrankiteHide

Lustre:
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 OlgafrankiteHide

Reflectivity:
WavelengthR1 (%)
470nm43.3%
546nm51.8%
589nm51.8%
650nm59.7%


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 OlgafrankiteHide

Mindat Formula:
Ni3Ge
Element Weights:
Element% weight
Ni70.795 %
Ge29.206 %

Calculated from ideal end-member formula.
Elements listed:
Ge, Ni - search for minerals with similar chemistry

Crystallography of OlgafrankiteHide

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 DiffractionHide

Type Occurrence of OlgafrankiteHide

Type Locality:
ⓘ Olgafrankite type locality, Dzheltul'skii massif (Dzhaltul), Kureika river, Taymyrsky Dolgano-Nenetsky District, Krasnoyarsk Krai, Russia
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:
CoheniteMagnetiteNative Iron
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 OlgafrankiteHide

Other Language Names for OlgafrankiteHide

Relationship of Olgafrankite to other SpeciesHide

Member of:
Auricupride Subgroup > Non-stoichiometric Perovskites Group > Perovskite Supergroup
Other Members of Auricupride Subgroup:
AuricuprideCu3AuIso. m3m(4/m32/m) : Pm3m
CuproaurideCu3Au

Related Minerals - Strunz-mindat GroupingHide

2.AB.10OrceliteNi5-xAs2, x ~ 0.25Hex. 6mm : P63mc
2.AB.15MaucheriteNi11As8Tet. 422 : P41212

Fluorescence of OlgafrankiteHide

Other InformationHide

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 OlgafrankiteHide

References for OlgafrankiteHide

Localities for OlgafrankiteHide

Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Krasnoyarsk Krai
    • Taymyrsky Dolgano-Nenetsky District
      • Kureika river
        • Dzheltul'skii massif (Dzhaltul)
Vereshchagin et al. (2024) +1 other reference
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