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Chadwickite

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About ChadwickiteHide

James Chadwick (1891-1974)
Formula:
(UO2)[HAsO3]
Colour:
Yellow
Lustre:
Dull
Hardness:
2
Crystal System:
Tetragonal
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 ChadwickiteHide

Approved
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

Physical Properties of ChadwickiteHide

Colour:
Yellow
Hardness:

Optical Data of ChadwickiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.840 nε = 1.750
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of ChadwickiteHide

Formula:
(UO2)[HAsO3]
IMA Formula:
(UO2)(HAsO3)

Crystallography of ChadwickiteHide

Crystal System:
Tetragonal
Cell Parameters:
a = 11.00(1) Å, c = 15.96(2) Å
Ratio:
a:c = 1 : 1.451
Unit Cell V:
1,931.16 ų (Calculated from Unit Cell)
Comment:
From indexing of PXRD pattern. Crystal class and space group unknown.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.58 (80)
4.95 (100)
4.40 (60)
3.33 (80)
3.03 (60)
2.91 (50)

Type Occurrence of ChadwickiteHide

General Appearance of Type Material:
yellow, earthy and scaly crusts in which single grains are partly transparent, up to 20 µm across, and rarely exhibit a rectangular or square form of the tabular face {001}.
Place of Conservation of Type Material:
Staatliches Museum für Naturkunde, Stuttgart
Institut für Mineralogie und Kristallchemie der Universität Stuttgart

Synonyms of ChadwickiteHide

Other Language Names for ChadwickiteHide

German:Chadwickit
Spanish:Chadwickita

Related Minerals - Nickel-Strunz GroupingHide

4.JA.05LeiteiteZn(As2O4)Mon. 2/m : P21/b
4.JA.10ReineriteZn3(AsO3)2Orth.
4.JA.15KaribibiteFe3+3(As3+O2)4(As3+2O5)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
4.JA.20KusachiiteCuBi2O4Tet.
4.JA.20SchafarzikiteFe2+Sb3+2O4Tet. 4/mmm (4/m 2/m 2/m) : P42/mbc
4.JA.20TrippkeiteCu2+As3+2O4Tet. 4/mmm (4/m 2/m 2/m) : P42/mbc
4.JA.25ApuaniteFe2+Fe3+4Sb3+4O12STet. 4/mmm (4/m 2/m 2/m) : P42/mbc
4.JA.30VersiliaiteFe2Fe4Sb6O16SOrth.
4.JA.35SchneiderhöhniteFe2+Fe3+3As3+5O13Tric. 1 : P1
4.JA.40Zimbabweite(Na,K)2PbAs4(Ta,Nb,Ti)4O18Orth.
4.JA.45LudlockitePbFe3+4As3+10O22Tric. 1 : P1
4.JA.50PaulmooreitePb2[As2O5]Mon. 2/m : P21/b
4.JA.55StibivaniteSb2VO5Orth.

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 ChadwickiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K. (1998) Chadwickite, a new uranyl arsenite from Wittichen in the Black Forest. Aufschluss: 49: 253-257 [in German with English abstract].
Jambor, J.L., Pertsev, N.N., and Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 1195-1198.

Internet Links for ChadwickiteHide

Localities for ChadwickiteHide

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.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Baden-Baden
        • Müllenbach U deposit
Specimen in Chuck Adan collection. Analyzed by Dr. Wilfried Bär, a chemist from Bad Elster, Germany on an old sample collected in 1978 and obtained from Carsten Slotta; Chuck Adan collection. Analyzed by Dr. Wilfried Bär, a chemist from Bad Elster, Germany on a sample collected in 1978. Obtained from Carsten Slotta 2018.
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
Jambor, J.L., Pertsev, N.N., and Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 1195-1198.; Markl, G. and Slotta, C. (2011) Die Uranmineralien des Lagerstättenreviers Wittichen im mittleren Schwarzwald. Lapis 36(3): 25-37; 54 (in German).
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion District Mines
          • Paleokamariza area
            • Paleokamariza Mines
Michalis Fitros collection (EDS analysis, SXRD planned); Branko Rieck collection (EDS and SXRD analyses)
Mineral and/or Locality  
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