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Olmsteadite

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About OlmsteaditeHide

Formula:
KFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2O
Hardness:
4
Crystal System:
Orthorhombic
Name:
Named in 1976 by Paul Brian Moore, Takaharu Araki, Anthony R. Kampf, and Ian M. Steele in honor of Milo C. Olmstead [December 5, 1909, Gillett Grove, Iowa, USA - June 4, 2005, Rapid City, South Dakota, USA], amateur collector of microscopic minerals, who called attention to the mineral.
The Fe analogue of johnwalkite.


Classification of OlmsteaditeHide

Approved
Approval Year:
1974
8.DJ.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
42.7.11.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
22.5.13

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate

Pronounciation of OlmsteaditeHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of OlmsteaditeHide

Hardness:

Optical Data of OlmsteaditeHide

Type:
Biaxial (+)
RI values:
nα = 1.725 - 1.765 nβ = 1.755 - 1.775 nγ = 1.815 - 1.835
2V:
Measured: 60° , Calculated: 46° to 74°
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v moderate

Chemical Properties of OlmsteaditeHide

Formula:
KFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2O
IMA Formula:
KFe2+2NbO2(PO4)2 · 2H2O

Crystallography of OlmsteaditeHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 7.47 Å, b = 10.03 Å, c = 6.53 Å
Ratio:
a:b:c = 0.745 : 1 : 0.651
Unit Cell V:
489.25 ų (Calculated from Unit Cell)

Crystallographic forms of OlmsteaditeHide

Crystal Atlas:
Image Loading
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Olmsteadite - Tabular {001}
Olmsteadite - Tabular {100}
3d models and HTML5 code kindly provided by www.smorf.nl.

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Type Occurrence of OlmsteaditeHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 135924.

Synonyms of OlmsteaditeHide

Other Language Names for OlmsteaditeHide

Related Minerals - Nickel-Strunz GroupingHide

8.DJ.05JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.
8.DJ.10GatumbaiteCaAl2(PO4)2(OH)2 · H2OMon. 2/m : P2/m
8.DJ.15CamgasiteCaMg(AsO4)(OH) · 5H2OMon. 2/m : P21/m
8.DJ.20Phosphofibrite(H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2OMon. 2/m
8.DJ.20Meurigite-KKFe3+8(PO4)6(OH)7 · 6.5H2OMon. 2/m : B2/b
8.DJ.20Meurigite-NaNaFe3+8(PO4)6(OH)7 · 6.5H2OMon. 2/m : B2/b
8.DJ.25JungiteCa2Zn4Fe3+8(PO4)9(OH)9 · 16H2OOrth.
8.DJ.30WycheproofiteNaAlZr(PO4)2(OH) · H2OTric.
8.DJ.35ErcititeNa2Mn3+2(PO4)2(OH)2 · 4H2OMon.
8.DJ.40MrázekiteBi2Cu3(PO4)2O2(OH)2 · H2OMon. 2/m
8.DJ.45AttikaiteCa3Cu2Al2(AsO4)4(OH)4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pban

Related Minerals - Dana Grouping (8th Ed.)Hide

42.7.11.2JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.5.1VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
22.5.2EmbreyitePb5(CrO4)2(PO4)2 · H2OMon. 2/m : B2/m
22.5.3CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
22.5.4FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
22.5.5MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)Mon.
22.5.6Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m
22.5.7Paramendozavilite[KAl4(H2O)30][Mo12P6Fe3+6O60(OH)13]Mon.
22.5.8Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.9Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
22.5.10Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Orth. mmm (2/m 2/m 2/m) : Pmna
22.5.11Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
22.5.12RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2OMon. 2/m : P21/m
22.5.14JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.

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 OlmsteaditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Moore, P. B., Araki, T., Kampf, A. R. & Steele, I. M. (1976) Olmsteadite, K2Fe2+2[Fe2+2(Nb,Ta)5+2O4(H2O)4(PO4)4], a new species, its crystal structure and relation to vauxite and montgomeryite. American Mineralogist, 61, 5-11.

Internet Links for OlmsteaditeHide

Localities for OlmsteaditeHide

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.
USA (TL)
 
  • South Dakota
    • Pennington Co.
      • Keystone Mining District
        • Glendale
American Mineralogist, Volume 61, pages 5-ll, 1976
American Mineralogist, Volume 61, pages 5-ll, 1976
        • Keystone
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
 
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