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Goldschmidtite

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Victor Moritz Goldschmidt
Formula:
KNbO3
Colour:
Dark green
Lustre:
Adamantine
Specific Gravity:
5.32 (Calculated)
Crystal System:
Isometric
Name:
Named in honor of Victor Moritz Goldschmidt* (27 January 1888, Zürich, Switzerland – 20 March 1947, Oslo. Norway), the eminent geochemist who formalized perovskite crystal chemistry and identified KNbO3 as a perovskite-structured compound. He is considered (together with Vladimir Vernadsky) to be the founder of modern geochemistry and crystal chemistry, developer of the Goldschmidt Classification of elements.

* Not to be confused with Victor Mordechai Goldschmidt, of Germany, who wrote Atlas der Krystallformen and for whom Goldschmidtite (of Hobbs) is named.
The K analogue of isolueshite.
Found as inclusions in diamond.

Not to be confused with Goldschmidtite (of Hobbs) [https://www.mindat.org/min-7543.html], a synonym of sylvanite.


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Classification of GoldschmidtiteHide

Approved
Approval Year:
2018
First Published:
2019

Physical Properties of GoldschmidtiteHide

Adamantine
Transparency:
Opaque
Colour:
Dark green
Density:
5.32(3) g/cm3 (Calculated)

Chemical Properties of GoldschmidtiteHide

Formula:
KNbO3
Emperical Formula (of original material):
(K0.504La0.150Sr0.133Ba0.092Ce0.078Ca0.002 Th0.001)Σ0.960(Nb0.695Cr0.192Fe0.051Al0.014Mg0.036Ti0.011)Σ0.999O3

Crystallography of GoldschmidtiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Pm3m
Setting:
Pm3m
Cell Parameters:
a = 3.9875(1) Å
Unit Cell V:
63.40 ų (Calculated from Unit Cell)
Twinning:
None observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.820 Å(100)
1.994 Å(50)
1.628 Å(58)
1.410 Å(36)
1.261 Å(28)
1.066 Å(38)
0.892 Å(30)
0.814 Å(43)
Comments:
From Type Description.

Type Occurrence of GoldschmidtiteHide

General Appearance of Type Material:
Green, opaque inclusion (~100 microns) in diamond.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada, accession number M58208
Associated Minerals at Type Locality:
Reference:
Meyer, N.A., Wenz, M.D., Walsh, J.P.S., Jacobsen, S.D., Locock, A.J., Harris, J.W. (2019) Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa. American Mineralogist: 104(9): 1345-1350.

Synonyms of GoldschmidtiteHide

Other Language Names for GoldschmidtiteHide

Relationship of Goldschmidtite to other SpeciesHide

Other Members of this group:
BarioperovskiteBaTiO3Orth. mm2 : Amm2
Isolueshite(Na,La)NbO3Iso. m3m (4/m 3 2/m) : Pm3m
LakargiiteCa(Zr,Sn,Ti)O3Orth. mmm (2/m 2/m 2/m) : Pnma
Loparite-(Ce)(Na,REE)Ti2O6Iso. m3m (4/m 3 2/m)
LueshiteNaNbO3Orth. mmm (2/m 2/m 2/m)
MacedonitePbTiO3Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
MegawiteCaSnO3Orth. mmm (2/m 2/m 2/m) : Pban
PerovskiteCaTiO3Orth. mmm (2/m 2/m 2/m) : Pnma
TausoniteSrTiO3Iso. 4 3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for GoldschmidtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Meyer, N.A., Wenz, M.D., Walsh, J.P.S., Jacobsen, S.D., Locock, A.J. and Harris, J.W. (2018) Goldschmidtite, IMA 2018-034. CNMNC Newsletter No. 44, August 2018, page xxx. Mineralogical Magazine: 82: xxx–xxx.
Meyer, N.A., Wenz, M.D., Walsh, J.P.S., Jacobsen, S.D., Locock, A.J., Harris, J.W. (2019) Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa. American Mineralogist: 104(9): 1345-1350.

Internet Links for GoldschmidtiteHide

Localities for GoldschmidtiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
South Africa (TL)
 
  • Free State
    • Xhariep District
      • Koffiefontein
Meyer, N.A., Wenz, M.D., Walsh, J.P.S., Jacobsen, S.D., Locock, A.J., Harris, J.W. (2019) Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa. American Mineralogist: 104(9): 1345-1350.
 
Mineral and/or Locality  
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