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Chadwickite

Formula:
(UO
 
2
)[HAsO
 
3
]
System:TetragonalLustre:Earthy
Hardness:2
Name:Named after Sir James Chadwick (1891-1974), English physicist, Cavendish Laboratory, University
of Cambridge, U.K., Nobel Prize winner in 1935 for his discovery of the neutron.
This page provides mineralogical data about Chadwickite.

Classification of Chadwickite

IMA status:Approved
Strunz 8th edition ID:4/J.05-10
Nickel-Strunz 10th (pending) edition ID:4.JA.60

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
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Type Occurrence of Chadwickite

Type Locality:Sophia Mine, Böckelsbach valley, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany

Physical Properties of Chadwickite

Lustre:Earthy
Hardness (Mohs):2

Crystallography of Chadwickite

Crystal System:Tetragonal

Optical Data of Chadwickite

Type:Uniaxial (-)
RI values: nω = 1.840 nε = 1.750
Maximum Birefringence:δ = 0.090

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

Chemical Properties of Chadwickite

Formula:
(UO
 
2
)[HAsO
 
3
]
Essential elements:As, H, O, U
All elements listed in formula:As, H, O, U

Relationship of Chadwickite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JA.05Leiteite
Zn[As
 
2
O
 
4
]
4.JA.10Reinerite
Zn
 
3
(AsO
 
3
)
 
2
4.JA.15Karibibite
Fe
 
2
As
 
4
O
 
9
4.JA.20Kusachiite
CuBi
 
2
O
 
4
4.JA.20Schafarzikite
Fe
2+
 
Sb
3+
2
O
 
4
4.JA.20Trippkeite
Cu[As
 
2
O
 
4
]
4.JA.25Apuanite
Fe
2+
 
Fe
3+
4
Sb
3+
4
O
 
12
S
4.JA.30Versiliaite
Fe
 
2
Fe
 
4
Sb
 
6
O
 
16
S
4.JA.35Schneiderhöhnite
Fe
2+
 
Fe
3+
3
[As
 
5
O
 
13
]
4.JA.40Zimbabweite
(Na,K)
 
2
PbAs
 
4
(Ta,Nb,Ti)
 
4
O
 
18
4.JA.45Ludlockite
PbFe
3+
4
As
3+
10
O
 
22
4.JA.50Paulmooreite
Pb
 
2
[As
 
2
O
 
5
]
4.JA.55Stibivanite
Sb
 
2
VO
 
5

Other Names for Chadwickite

Synonyms:
IMA1997-005
Other Languages:
German:Chadwickit
Spanish:Chadwickita

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 Chadwickite

Reference List:Aufschluss: 49: 253-257.

Internet Links for Chadwickite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Chadwickite in the Natural History Museum (London) online catalogue
  • Chadwickite details from Handbook of Mineralogy (PDF)
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    Localities for Chadwickite

    (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.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Schenkenzell
          • Wittichen
            • Böckelsbach valley
    		American Mineralogist, Volume 84, pages 1195–1198, 1999
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 5th Nov 2009 18:10:01