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Chadwickite

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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.


Hide all sections | Show all sections

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

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

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.20TrippkeiteCu[As2O4]Tet. 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+3[As5O13]Tric. 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. [Abs. in American Mineralogist 84 (1999) 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 (TL)
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
American Mineralogist, Volume 84, pages 1195–1198, 1999; Markl, G. & Slotta, C. (2011): Die Uranmineralien des Lagerstättenreviers Wittichen im mittleren Schwarzwald. Lapis 36 (3), 25-37; 54 (in German).
Mineral and/or Locality  
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