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Bi243+Cr86+O57(OH)6 · 3H2O
Yellow to yellow-brown
3 - 4
Named for Duke University, North Carolina and for the Duke Family.
This page provides mineralogical data about Dukeite.

Classification of Dukeite


7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
Dana 7th ed.: URL:
Please feel free to link to this page.

Type Occurrence of Dukeite

Physical Properties of Dukeite

Yellow to yellow-brown
Bright Yellow
Hardness (Mohs):
3 - 4

Crystallography of Dukeite

Crystal System:

Optical Data of Dukeite

RI values:
nα = 2.330 nβ = 2.370
Max Birefringence:
δ = 2.330
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Dukeite

Bi243+Cr86+O57(OH)6 · 3H2O
All elements listed in formula:

Relationship of Dukeite to other Species

7.DF.05UklonskoviteNaMg(SO4)F · 2H2O
7.DF.10KainiteKMg(SO4)Cl · 3H2O
7.DF.15NatrochalciteNaCu2(SO4)2(OH) · 2H2O
7.DF.20MetasideronatriteNa2Fe(SO4)2(OH) · H2O
7.DF.20SideronatriteNa2Fe(SO4)2(OH) · 3H2O
7.DF.25DespujolsiteCa3Mn4+(SO4)2(OH)6 · 3H2O
7.DF.25FleischeritePb3Ge(SO4)2(OH)6 · 3H2O
7.DF.25SchaurteiteCa3Ge(SO4)2(OH)6 · 4H2O
7.DF.25MallestigitePb3Sb5+(SO4)(AsO4)(OH)6 · 3H2O
7.DF.30Slavíkite(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O
7.DF.35MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
7.DF.40LannoniteMg2Ca4Al4(SO4)8F8 · 24H2O
7.DF.40VlodavetsiteAlCa2(SO4)2F2Cl · 4H2O
7.DF.45PeretaiteCa(SbO)4(SO4)2(OH)2 · 2H2O
7.DF.50GordaiteNaZn4(SO4)(OH)6Cl · 6H2O
7.DF.55Clairite(NH4)2Fe3(SO4)4(OH)3 · 3H2O
7.DF.60ArzruniteCu4Pb2(SO4)(OH)4Cl6 · 2H2O (?)
7.DF.65ElyitePb4Cu(SO4)O2(OH)4 · H2O
7.DF.70YecoraiteFe33+Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O
7.DF.75RiomarinaiteBi(SO4)(OH) · H2O
7.DF.85XocolatliteCa2Mn24+(Te6+O6)2 · H2O

Other Names for Dukeite

Name in Other Languages:

Other Information

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 Dukeite

Reference List:
Burns, P. C., Roberts, A. C., Stirling, J. A. R., Criddle, A. J. and Feinglos, M. N. (2000): Dukeite, Bi243+Cr86+O57(OH)6(H2O)3, a new mineral from Brejauba, Minas Gerais, Brazil: description and crystal structure. American Mineralogist: 85, 1822-1827.

Internet Links for Dukeite

Localities for Dukeite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Brazil (TL)
  • Minas Gerais
    • Conceição do Mato Dentro
      • São José de Brejaúba (São José de Bryamba)
[MinRec 32:416]
  • Lorraine
    • Vosges
Georges Favreau
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