Chadwickite
A valid IMA mineral species
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About Chadwickite
James Chadwick (1891-1974)
Formula:
(UO2)[HAsO3]
Colour:
Yellow
Lustre:
Dull
Hardness:
2
Specific Gravity:
4.86 (Calculated)
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.
Unique Identifiers
Mindat ID:
6858
Long-form identifier:
mindat:1:1:6858:7
GUID
(UUID V4):
(UUID V4):
95b28024-5d39-491e-9cc1-b294a837f13a
IMA Classification of Chadwickite
Approved
IMA Formula:
(UO2)(HAsO3)
First published:
1998
Classification of Chadwickite
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
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Cdw | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Chadwickite
Dull
Colour:
Yellow
Streak:
Yellow
Hardness:
2 on Mohs scale
Cleavage:
Perfect
{001}
{001}
Fracture:
Irregular/Uneven
Density:
4.86 g/cm3 (Calculated)
Optical Data of Chadwickite
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.
and does not take into account mineral colouration.
Surface Relief:
Very High
Chemistry of Chadwickite
Mindat Formula:
(UO2)[HAsO3]
Elements listed:
Crystallography of Chadwickite
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.58 Å | (80) |
| 4.95 Å | (100) |
| 4.40 Å | (60) |
| 3.33 Å | (80) |
| 3.03 Å | (60) |
| 2.91 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47f : [Uranyl (U⁶⁺) minerals] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Chadwickite
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, Germany.
Institut für Mineralogie und Kristallchemie der Universität Stuttgart, Germany.
Institut für Mineralogie und Kristallchemie der Universität Stuttgart, Germany.
Reference:
Walenta, K. (1998) Chadwickite, a new uranyl arsenite from Wittichen in the Black Forest. Aufschluss: 49: 253-257.
Synonyms of Chadwickite
Other Language Names for Chadwickite
German:Chadwickit
Spanish:Chadwickita
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 4.JA. | Manganoschafarzikite | MnSb2O4 |
| 4.JA.05 | Leiteite | Zn(As2O4) |
| 4.JA.10 | Reinerite | Zn3(AsO3)2 |
| 4.JA.15 | Karibibite | Fe3+3(As3+O2)4(As3+2O5)(OH) |
| 4.JA.20 | Kusachiite | CuBi2O4 |
| 4.JA.20 | Schafarzikite | Fe2+Sb3+2O4 |
| 4.JA.20 | Trippkeite | Cu2+As3+2O4 |
| 4.JA.25 | Apuanite | Fe2+Fe3+4Sb3+4O12S |
| 4.JA.30 | Versiliaite | Fe2Fe4Sb6O16S |
| 4.JA.35 | Schneiderhöhnite | Fe2+Fe3+3As3+5O13 |
| 4.JA.40 | Zimbabweite | (Na,K)2PbAs4(Ta,Nb,Ti)4O18 |
| 4.JA.45 | Ludlockite | PbFe3+4As3+10O22 |
| 4.JA.50 | Paulmooreite | Pb2[As2O5] |
| 4.JA.55 | Stibivanite | Sb2VO5 |
Fluorescence of Chadwickite
Not fluorescent
Other Information
Notes:
Readily soluble in 1:1 HNO3 or HCl
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Chadwickite
mindat.org URL:
https://www.mindat.org/min-6858.html
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References for Chadwickite
Reference List:
Localities for Chadwickite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| |
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Greece | |
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Paliokamariza Mine No. 18, Paliokamariza Mines, Plaka, Lavrion Mining District, Lavreotiki, East Attica, Attica, Greece