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Dukeite

Formula:
Bi
 
24
Cr
6+
8
O
 
57
(OH)
 
6
(H
 
2
O)
 
3
System:TrigonalColour:Yellow to yellow-brown
Lustre:ResinousHardness:3 - 4
Name:Named for Duke University, North Carolina and for the Duke Family.
This page provides mineralogical data about Dukeite.

Classification of Dukeite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID:7.DF.80

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 edition ID:35.4.6.1
mindat.org URL:http://www.mindat.org/min-7089.html
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Type Occurrence of Dukeite

Type Locality:Posse Mine (Posse Farm), São José de Brejaúba (São José de Bryamba), Conceição do Mato Dentro, Minas Gerais, Southeast Region, Brazil

Physical Properties of Dukeite

Lustre:Resinous
Colour:Yellow to yellow-brown
Streak:Bright Yellow
Hardness (Mohs):3 - 4

Crystallography of Dukeite

Crystal System:Trigonal

Optical Data of Dukeite

Type:Uniaxial
RI values: nα = 2.330 nβ = 2.370
Maximum Birefringence:δ = 2.330

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Dukeite

Formula:
Bi
 
24
Cr
6+
8
O
 
57
(OH)
 
6
(H
 
2
O)
 
3
Essential elements:Bi, Cr, H, O
All elements listed in formula:Bi, Cr, H, O

Relationship of Dukeite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.DF.05Uklonskovite
NaMg[F|SO
 
4
] · 2H
 
2
O
7.DF.10Kainite
KMg[Cl|SO
 
4
] · 3H
 
2
O
7.DF.15Natrochalcite
NaCu
 
2
[OH|(SO
 
4
)
 
2
] · 2H
 
2
O
7.DF.20Metasideronatrite
Na
 
4
Fe
 
2
(SO
 
4
)
 
4
(OH)
 
2
·2H
 
2
O
7.DF.20Sideronatrite
Na
 
2
Fe(SO
 
4
)
 
2
OH·3H
 
2
O
7.DF.25Despujolsite
Ca
 
3
Mn
4+
 
[(OH)
 
6
|(SO
 
4
)
 
2
] · 3H
 
2
O
7.DF.25Fleischerite
Pb
 
3
Ge[(OH)
 
6
|(SO
 
4
)
 
2
] · 3H
 
2
O
7.DF.25Schaurteite
Ca
 
3
Ge[(OH)
 
6
|(SO
 
4
)
 
2
] · 4H
 
2
O
7.DF.25Mallestigite
Pb
 
3
Sb
5+
 
[(OH)
 
6
|AsO
 
4
|SO
 
4
] · 3H
 
2
O
7.DF.30Slavíkite
(H
 
3
O
+
 
)
 
3
Mg
 
6
Fe
 
15
(SO
 
4
)
 
21
(OH)
 
18
·99H
 
2
O
7.DF.35Metavoltine
Na
 
6
K
 
2
FeFe
 
6
(SO
 
4
)
 
12
O
 
2
·18H
 
2
O
7.DF.40Lannonite
HCa
 
4
Mg
 
2
Al
 
4
(SO
 
4
)
 
8
F
 
9
·32H
 
2
O
7.DF.40Vlodavetsite
AlCa
 
2
[F
 
2
|Cl|(SO
 
4
)
 
2
] · 4H
 
2
O
7.DF.45Peretaite
Ca(SbO)
 
4
[(OH)|SO
 
4
]
 
2
 · 2H
 
2
O
7.DF.50Gordaite
NaZn
 
4
[(OH)
 
6
|SO
 
4
|Cl] · 6H
 
2
O
7.DF.55Clairite
(NH
 
4
)
 
2
Fe
 
3
(SO
 
4
)
 
4
(OH)
 
3
·3H
 
2
O
7.DF.60Arzrunite
near Cu
 
4
Pb
 
2
SO
 
4
Cl
 
6
(OH)
 
4
·2H
 
2
O
7.DF.65Elyite
Pb
 
4
Cu(SO
 
4
)O
 
2
(OH)
 
4
·H
 
2
O
7.DF.70Yecoraite
Fe
3+
3
(BiO)
 
5
(Te
4+
 
O
 
3
)(Te
6+
 
O
 
6
)
 
2
 · 9H
 
2
O
7.DF.75Riomarinaite
Bi(OH)(SO
 
4
) * H
 
2
O
7.DF.85Xocolatlite
Ca
 
2
Mn
4+
2
Te
6+
2
O
 
12
·H
 
2
O

Other Names for Dukeite

Synonyms:
IMA1999-021
Other Languages:
German:Dukeit
Russian:Дюкит
Spanish:Dukeita

Other Information

Health Warning: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

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    Localities for Dukeite

    (TL) indicates type locality. ? 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
     
    • Southeast Region
      • Minas Gerais
        • Conceição do Mato Dentro
          • São José de Brejaúba (São José de Bryamba)
    		[MinRec 32:416]
    Mineral and/or Locality
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