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About AhlfelditeHide

Friedrich Ahlfeld
Ni(SeO3) · 2H2O
May contain minor Co.
apple-green, brown, pink, yellowish
2 - 2½
Specific Gravity:
Crystal System:
Named in honor of Friedrich Ahlfeld ( 6 October 1892, Marburg, German Empire - 9 January 1982, Cochabamba, Bolivia), German-Bolivian mining engineer and geologist, known as the "Father of Bolivian Geology." He built several important collections of Bolivian minerals.
This page provides mineralogical data about Ahlfeldite.

Classification of AhlfelditeHide

Approved, 'Grandfathered' (first described prior to 1959)

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
H : Selenites without additional anions, with H2O
Dana 7th ed.:

2 : A(XO3)·xH2O

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites

Physical Properties of AhlfelditeHide

apple-green, brown, pink, yellowish
Becomes more pink with increasing cobalt content.
pale green, white
2 - 2½ on Mohs scale
Fair on {110}{103}
3.37(2) g/cm3 (Measured)    3.51 g/cm3 (Calculated)

Optical Data of AhlfelditeHide

Biaxial (-)
RI values:
nα = 1.709 nβ = 1.752 nγ = 1.787
Measured: 85° , Calculated: 82°
Max Birefringence:
δ = 0.078
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v strong
X = pale green
Y = pale pink
Z = pink

Chemical Properties of AhlfelditeHide

Ni(SeO3) · 2H2O

May contain minor Co.
Common Impurities:

Crystallography of AhlfelditeHide

Crystal System:
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 7.53 Å, b = 8.76 Å, c = 6.43 Å
β = 99.08°
a:b:c = 0.86 : 1 : 0.734
Unit Cell V:
418.83 ų (Calculated from Unit Cell)
Rare crystals to 1mm, crusts, spherical aggregates

Geological EnvironmentHide

Geological Setting:
Alteration product of nickel sulfides and selenides

Type Occurrence of AhlfelditeHide

Other Language Names for AhlfelditeHide

Relationship of Ahlfeldite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Ahlfeldite associated with ChalcomeniteCuSeO3 · 2H2O
2 photos of Ahlfeldite associated with MolybdomenitePbSeO3
1 photo of Ahlfeldite associated with AnglesitePbSO4
1 photo of Ahlfeldite associated with Krut'aiteCuSe2

Related Minerals - Nickel-Strunz GroupingHide

4.JH.05ChalcomeniteCuSeO3 · 2H2OOrth. 2 2 2 : P21 21 21
4.JH.10ClinochalcomeniteCuSeO3 · 2H2OMon.
4.JH.10CobaltomeniteCoSeO3 · 2H2OMon.
4.JH.15MandarinoiteFe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0)Mon. 2/m : P21/b
4.JH.20OrlandiitePb3(SeO3)(Cl,OH)4 · H2O Tric.
4.JH.25LarisaiteNa(H3O)(UO2)3(SeO3)O2 · 4H2OMon. m : Pm

Related Minerals - Dana Grouping (8th Ed.)Hide · 2H2OMon. · 2H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

28.1.1ChalcomeniteCuSeO3 · 2H2OOrth. 2 2 2 : P21 21 21
28.1.2ClinochalcomeniteCuSeO3 · 2H2OMon.
28.1.3FrancisiteCu3Bi(SeO3)2O2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
28.1.6Haynesite(UO2)3(OH)2(SeO3)2 · 5H2OOrth.
28.1.8MarthoziteCu2+(UO2)3(SeO3)2O2 · 8H2OOrth.
28.1.9GuilleminiteBa(UO2)3(SeO3)2O2 · 3H2OOrth. mm2 : Pmn21
28.1.10DemesmaekeritePb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2OTric.
28.1.11MandarinoiteFe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0)Mon. 2/m : P21/b
28.1.12CobaltomeniteCoSeO3 · 2H2OMon.

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 AhlfelditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Herzenberg, R., Ahlfeld, F. (1935) Blockit, ein neues Selenerz aus Bolivien. Zentralblatt Mineralien, Abteilung A: 6: 277-279.
Herzenberg, R. (1945) Inst. Boliviano de Ing. De Minas y Geol., Publ. Técu, La Paz, no. 5.
Herzenberg, R. (1945) Mineria Boliviana: 2: no. 25.
Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 635.
Fleischer, M. (1963) New mineral names. American Mineralogist: 48: 1183.
Aristarain, L.F., Hurlbut, C.S. (1969) Ahlfeldite from Pacacake Bolivia; A restudy. American Mineralogist: 54: 448-456.
Sturman, B.D., Mandarino, J.A. (1974) The ahlfeldite-cobaltomenite series. The Canadian Mineralogist: 12: 304-307.
Wildner, M. (1990) Crystal structure refinements of synthetic cobaltomenite (CoSeO3·2H2O) and ahlfeldite (NiSeO3·2H2O). Neues Jahrbuch für Mineralogie, Monatshefte: 1990: 353-362.
Boletín Facultad de cienncias exactus, físicas y naturals, Universidad nacional de Córdoba: 7: 1-4.
Charykova, M.V., Krivovichev, V.G., Lelet, M.I., Yakovenko, O.S., Suleimanov, E.V., Depmeier, W., Semenova, V.V., Zorina, M.L. (2014) A calorimetric and thermodynamic investigation of the synthetic analogs of cobaltomenite, CoSeO3·2H2O, and ahlfeldite, NiSeO3·2H2O. American Mineralogist: 99: 742-748.

Internet Links for AhlfelditeHide

Localities for AhlfelditeHide

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.
  • Potosí
    • Antonio Quijarro Province
[MinRec 21:133]; Grundmann, G. and Förster H.-J. (2017) Origin of the El Dragón Selenium Mineralization, Quijarro Province, Potosí, Bolivia. Minerals, 7(5), 68; doi:10.3390/min7050068
    • Chayanta Province
      • Pakajake Canyon (Pacajake Canyon)
Herzenberg (1935) Zentralbl. Min., Abt. A: 189 & 279. Palache, C., Berman, H., & Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 635. Petrov, A., Smith, B., Smith, C. (2001) A Guide to Mineral Localities in Bolivia. Mineralogical Record Vol.32(6), pp. 457-482. Hurlbut, C.S., Aristarain, L.F. (1969) Olsacherite Pb₂(SeO₄)(SO₄), A New Mineral from Bolivia. The American Mineralogist. Vol.5, November-December, pp. 1519-1527.
Mineral and/or Locality  
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