Mansfieldite
A valid IMA mineral species - grandfathered
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About Mansfieldite
George R. Mansfield
Formula:
AlAsO4 · 2H2O
Colour:
White, light gray; colourless in transmitted light.
Hardness:
3½ - 4
Specific Gravity:
3.03
Crystal System:
Orthorhombic
Member of:
Name:
After George R. Mansfield (1875-1947), American geologist, U.S. Geological Survey.
Unique Identifiers
Mindat ID:
2568
Long-form identifier:
mindat:1:1:2568:9
GUID
(UUID V4):
(UUID V4):
39a76df4-f556-4651-bbb3-96a2728a69d7
IMA Classification of Mansfieldite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Al(AsO4) · 2H2O
Classification of Mansfieldite
8.CD.10
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
40.4.1.4
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
20.4.1
20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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 |
|---|---|---|
| Mfd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Mansfieldite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Mansfieldite
Transparency:
Transparent
Colour:
White, light gray; colourless in transmitted light.
Hardness:
3½ - 4 on Mohs scale
Cleavage:
Imperfect/Fair
On {201}, imperfect; on {001} and {100} in traces.
On {201}, imperfect; on {001} and {100} in traces.
Fracture:
Sub-Conchoidal
Density:
3.03 g/cm3 (Measured)
Comment:
Measured value on Hobart Butte material.
Optical Data of Mansfieldite
Type:
Biaxial (+)
RI values:
nα = 1.622 - 1.631 nβ = 1.624 - 1.649 nγ = 1.642 - 1.663
2V:
Measured: 30° to 68°, Calculated: 38° to 82°
Max Birefringence:
δ = 0.020 - 0.032
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:
Moderate
Dispersion:
none
Chemistry of Mansfieldite
Mindat Formula:
AlAsO4 · 2H2O
Elements listed:
Crystallography of Mansfieldite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 8.8218 Å, b = 9.8252 Å, c = 10.1163 Å
Ratio:
a:b:c = 0.898 : 1 : 1.03
Unit Cell V:
876.8 ų
Morphology:
Porous, cellular masses and crusts of spherulitic fibers.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010322 | Mansfieldite | Harrison W T A (2000) Synthetic mansfieldite, AlAsO4*2H2O Acta Crystallographica C56 e421-e421 | 2000 | synthetic | 0 | 293 | |
| 0010489 | Mansfieldite | Zoppi M, Pratesi G (2009) Rietveld refinment of a natural cobaltian mansfieldite from synchrotron data Acta Crystallographica E65 i6-i7 |  | 2009 | Mt. Cobalt, Cloncurry District, Queensland, Australia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.45 Å | (vvs) |
| 4.36 Å | (vvs) |
| 3.97 Å | (ms) |
| 3.09 Å | (vs) |
| 2.98 Å | (s) |
| 2.52 Å | (s) |
| 1.627 Å | (ms) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 46 : Near-surface hydrothermal alteration of minerals (see also #22) |
Type Occurrence of Mansfieldite
Associated Minerals at Type Locality:
Other Language Names for Mansfieldite
German:Mansfieldit
Russian:Мансфильдит
Simplified Chinese:砷铝石
Spanish:Mansfieldita
Traditional Chinese:砷鋁石
Varieties of Mansfieldite
| Cobalt-bearing Mansfieldite | A cobalt-bearing variety of mansfieldite. |
| Copper-bearing Mansfieldite | A copper-bearing variety of Mansfieldite. |
Relationship of Mansfieldite to other Species
Member of:
Other Members of this group:
| Scorodite | Fe3+AsO4 · 2H2O | Orth. mmm (2/m 2/m 2/m) |
| Strengite | FePO4 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
| Variscite | AlPO4 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
| Yanomamite | InAsO4 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Pbca |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 32 photos of Mansfieldite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 25 photos of Mansfieldite associated with Smolyaninovite | Co3Fe3+2(AsO4)4 · 11H2O |
| 17 photos of Mansfieldite associated with Olivenite | Cu2(AsO4)(OH) |
| 12 photos of Mansfieldite associated with Heterogenite | Co3+O(OH) |
| 10 photos of Mansfieldite associated with Rruffite | Ca2Cu(AsO4)2 · 2H2O |
| 10 photos of Mansfieldite associated with Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
| 9 photos of Mansfieldite associated with Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
| 5 photos of Mansfieldite associated with Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| 4 photos of Mansfieldite associated with Cyanotrichite | Cu4Al2(SO4)(OH)12 · 2H2O |
| 3 photos of Mansfieldite associated with Carbonatecyanotrichite | Cu4Al2(CO3,SO4)(OH)12 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CD. | Castellaroite | Mn2+3(AsO4)2 · 4H2O |
| 8.CD. | Sergeysmirnovite | MgZn2(PO4)2 · 4H2O |
| 8.CD.05 | Kolbeckite | ScPO4 · 2H2O |
| 8.CD.05 | Metavariscite | AlPO4 · 2H2O |
| 8.CD.05 | Phosphosiderite | FePO4 · 2H2O |
| 8.CD.05 | Bonacinaite | Sc(AsO4) · 2H2O |
| 8.CD.10 | Scorodite | Fe3+AsO4 · 2H2O |
| 8.CD.10 | Strengite | FePO4 · 2H2O |
| 8.CD.10 | Variscite | AlPO4 · 2H2O |
| 8.CD.10 | Yanomamite | InAsO4 · 2H2O |
| 8.CD.15 | Parascorodite | FeAsO4 · 2H2O |
| 8.CD.20 | Ludlamite | Fe2+3(PO4)2 · 4H2O |
| 8.CD.25 | Sterlinghillite | Mn2+3(AsO4)2 · 3H2O |
| 8.CD.30 | Rollandite | Cu3(AsO4)2 · 4H2O |
| 8.CD.35 | Liversidgeite | Zn6(PO4)4 · 7H2O |
| 8.CD.40 | Thorasphite | Th2H(PO4,AsO4)3 · 6H2O |
Other Information
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 Mansfieldite
mindat.org URL:
https://www.mindat.org/min-2568.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Mansfieldite
Localities for Mansfieldite
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.
Algeria | |
| Analyzed by XRD by Dr. Joan Vinals (Barcelona) |
Australia | |
| Day +3 other references |
| Ferguson (1999) |
Chile | |
| Maurizio Dini collection +1 other reference |
| Ondruš et al. (2006) | |
| Anthony et al. (2000) | |
| Vincent Bourgoin Collection | |
| Robert A. Jenkins find - personal ... |
| samples analysed by Dr. Tony Kampf +1 other reference | |
| Uwe Kolitsch (powder XRD) +2 other references | |
| Josef Vajdak (2002) |
| samples analysed by Anthony Kampf +1 other reference |
China | |
| www.cicresources.com (2006) |
Czech Republic | |
| |
| Sejkora et al. (2006) |
France | |
| Queneau (n.d.) |
| Lheur et al. (2010) |
| Jean-Marie Claude collection +1 other reference |
Germany | |
| American Mineralogist: 67: 854. +1 other reference |
| Lapis (9) |
| Witzke (2012) |
Greece | |
| Rieck et al. (2018) |
Iran | |
| Daliran (2008) |
Italy | |
| Frau et al. (2001) |
| Stara et al. (1996) |
| Fernando Caboni et al. (2024) | |
| Fernando Caboni et al. (2024) |
| Brizzi et al. (1994) |
| Stara et al. (1996) | |
| Ciriotti M.E. and Blass.G. (2010) |
Kazakhstan | |
| Kopchenova et al. (1962) +3 other references |
Mexico | |
| Panczner (1987) |
Morocco | |
| Favreau et al. (2006) |
| Favreau et al. (2006) |
| Favreau et al. (2006) | |
| Favreau et al. (2006) |
| Favreau et al. (2006) |
North Macedonia | |
| Alois Lechner collection (analysed by G. Blass 2009, re-analysed by Uwe Kolitsch) |
Poland | |
| Ł. Kruszewski PXRD data (to be published soon) +3 other references |
Portugal | |
| Pedro Alves collection and analytical ... |
| Pedro Alves collection and analytical ... |
| Gomes et al. (2016) |
Russia | |
| Gamyanin et al. (2014) |
Slovakia | |
| Martin Števko |
Spain | |
| Calvo Rebollar et al. (2022) |
| Rewitzer et al. (2018) |
| Castroviejo (1990) |
| MinRec-2003-0708-315 |
| Fabre (n.d.) |
Switzerland | |
| Dill (2008) |
UK | |
| Golley et al. (1995) |
USA | |
| Castor et al. (2004) |
| Castor et al. (2004) | |
| Bowell et al. (2005) |
| Am Min (1948) +1 other reference |
| Gruner (1959) |
| Cannon (1975) |
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