Sainfeldite
A valid IMA mineral species
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About Sainfeldite
Formula:
Ca5(AsO4)2(AsO3OH)2 · 4H2O
Colour:
Colorless, pale pink
Lustre:
Sub-Vitreous, Resinous, Waxy
Hardness:
4
Specific Gravity:
3.04
Crystal System:
Monoclinic
Member of:
Name:
Named by Roland Pierrot in 1964 in honour of Paul Sainfeld [1916 France - 1998], mineralogist of Musée de Minéralogie, Ecole des Mines, Paris, France who discovered the mineral.
Type Locality:
Isostructural with:
Compare giftgrubeite, the ordered (Ca:Mn = 3:2) intermediate member between villyaellenite and sainfeldite.
Compare also the higher hydrates ferrarisite and its dimorph guérinite.
Compare also the higher hydrates ferrarisite and its dimorph guérinite.
Unique Identifiers
Mindat ID:
3503
Long-form identifier:
mindat:1:1:3503:9
GUID
(UUID V4):
(UUID V4):
94b593f4-4f67-474d-9451-5cf16107c69b
IMA Classification of Sainfeldite
Approved
First published:
1964
Classification of Sainfeldite
8.CJ.
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
39.2.1.2
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
20.2.9
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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 |
---|---|---|
Sai | 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 Sainfeldite
Sub-Vitreous, Resinous, Waxy
Transparency:
Transparent, Translucent
Colour:
Colorless, pale pink
Streak:
White
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
3.04(2) g/cm3 (Measured) 2.99(4) g/cm3 (Calculated)
Comment:
D ranges 2.99-3.027
Optical Data of Sainfeldite
Type:
Biaxial (-)
RI values:
nα = 1.600(2) nβ = 1.610(2) nγ = 1.616(2)
2V:
Measured: 80° (2), Calculated: 74°
Birefringence:
0.016
Max Birefringence:
δ = 0.016
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:
r < v weak
Optical Extinction:
X = b, Y^c ~ 20°
Pleochroism:
Non-pleochroic
Chemistry of Sainfeldite
Mindat Formula:
Ca5(AsO4)2(AsO3OH)2 · 4H2O
Elements listed:
Common Impurities:
Co
Crystallography of Sainfeldite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 18.781(7) Å, b = 9.820(4) Å, c = 10.191(4) Å
β = 97.0°
β = 97.0°
Ratio:
a:b:c = 1.913 : 1 : 1.038
Unit Cell V:
1865.43 ų
Z:
8
Morphology:
blades-prisms in radiating aggregates and rosettes
Comment:
C2/c setting; Bull. Min. 95:33 (1972) structure
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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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) |
---|---|---|---|---|---|---|---|
0012134 | Sainfeldite | Ferraris G, Abbona F (1972) The crystal structure of Ca5(HAsO4)2(AsO4)2*4H2O (Sainfeldite) Bulletin de la Societe Francaise de Mineralogie et de Cristallographie 95 33-41 | 1972 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.392 Å | (100) |
3.206 Å | (59) |
3.418 Å | (55) |
8.688 Å | (42) |
3.084 Å | (36) |
4.692 Å | (28) |
4.475 Å | (25) |
3.523 Å | (21) |
3.295 Å | (20) |
4.660 Å | (19) |
3.912 Å | (18) |
2.827 Å | (18) |
2.424 Å | (17) |
4.910 Å | (17) |
3.380 Å | (14) |
3.468 Å | (14) |
9.320 Å | (14) |
4.233 Å | (12) |
2.529 Å | (12) |
2.779 Å | (12) |
Comments:
Also see ICDD 16-615
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Sainfeldite
Place of Conservation of Type Material:
National School of Mines, Paris, France.
Geological Setting of Type Material:
Post-mine.
Reference:
Pierrot, R. (1964) Contribution à la minéralogie des arséniates calciques et calcomagnésiens naturels. Bulletin de la Société Française de Minéralogie et de Cristallographie: 87: 169-211.
Synonyms of Sainfeldite
Other Language Names for Sainfeldite
Relationship of Sainfeldite to other Species
Member of:
Other Members of this group:
Chongite | Ca3Mg2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O | Mon. 2/m : B2/b |
Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O | Mon. 2/m : B2/b |
Miguelromeroite | MnMn2Mn2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
Nyholmite | Cd3Zn2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
Villyaellenite | MnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O | Mon. 2/m : B2/b |
Common Associates
Associated Minerals Based on Photo Data:
36 photos of Sainfeldite associated with Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
23 photos of Sainfeldite associated with Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
19 photos of Sainfeldite associated with Erythrite | Co3(AsO4)2 · 8H2O |
7 photos of Sainfeldite associated with Hörnesite | Mg3(AsO4)2 · 8H2O |
6 photos of Sainfeldite associated with Weilite | Ca(HAsO4) |
6 photos of Sainfeldite associated with Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
5 photos of Sainfeldite associated with Pharmacolite | Ca(HAsO4) · 2H2O |
2 photos of Sainfeldite associated with Rauenthalite | Ca3(AsO4)2 · 10H2O |
2 photos of Sainfeldite associated with Phaunouxite | Ca3(AsO4)2 · 11H2O |
2 photos of Sainfeldite associated with Dolomite | CaMg(CO3)2 |
Related Minerals - Strunz-mindat Grouping
8.CJ. | Caesiumpharmacosiderite | CsFe4[(AsO4)3(OH)4] · 4H2O |
8.CJ. | Jeankempite | Ca5(AsO4)2(HAsO4)2 · 7H2O |
8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
8.CJ.10 | Mundrabillaite | (NH4)2Ca(PO3OH)2 · H2O |
8.CJ.10 | Swaknoite | (NH4)2Ca(PO3OH)2 · H2O |
8.CJ.15 | Nabaphite | NaBaPO4 · 9H2O |
8.CJ.15 | Nastrophite | Na(Sr,Ba)PO4 · 9H2O |
8.CJ.20 | Haidingerite | CaHAsO4 · H2O |
8.CJ.25 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
8.CJ.25 | Rhabdophane-(Y) | YPO4 · H2O |
8.CJ.27 | Churchite-(Dy) | (Dy,Sm,Gd,Nd)PO4 · 2H2O |
8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
8.CJ.35 | Fulbrightite | Ca(VO)2(AsO4)2 · 4H2O |
8.CJ.40 | Phaunouxite | Ca3(AsO4)2 · 11H2O |
8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
8.CJ.45 | Brockite | (Ca,Th,Ce)PO4 · H2O |
8.CJ.45 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
8.CJ.45 | Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
8.CJ.45 | Rhabdophane-(La) | La(PO4) · H2O |
8.CJ.45 | Rhabdophane-(Nd) | Nd(PO4) · H2O |
8.CJ.45 | Tristramite | (Ca,U,Fe)(PO4,SO4) · 2H2O |
8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
8.CJ.50 | Ardealite | Ca2(PO3OH)(SO4) · 4H2O |
8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
8.CJ.50 | Pharmacolite | Ca(HAsO4) · 2H2O |
8.CJ.50 | Churchite-(Nd) | Nd(PO4) · 2H2O |
8.CJ.55 | Mcnearite | NaCa5(AsO4)(HAsO4)4 · 4H2O |
8.CJ.60 | Dorfmanite | Na2(PO3OH) · 2H2O |
8.CJ.65 | Sincosite | Ca(VO)2(PO4)2 · 5H2O |
8.CJ.65 | Bariosincosite | Ba(VO)2(PO4)2 · 4H2O |
8.CJ.70 | Catalanoite | Na2(PO3OH) · 8H2O |
8.CJ.75 | Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
8.CJ.85 | Ningyoite | (U,Ca,Ce)2(PO4)2 · 1-2H2O |
Fluorescence of Sainfeldite
Not fluorescent.
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 Sainfeldite
mindat.org URL:
https://www.mindat.org/min-3503.html
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References for Sainfeldite
Reference List:
Pierrot, Roland (1964) Contribution à la minéralogie des arséniates calciques et calcomagnésiens naturels. Bulletin de Minéralogie, 87 (2) 169-211 doi:10.3406/bulmi.1964.5727
Rodriguez, J. D., Jimenez, A., Prieto, M., Torre, L., Garcia-Granda, S. (2008) Interaction of gypsum with As(V)-bearing aqueous solutions: Surface precipitation of guerinite, sainfeldite, and Ca2NaH(AsO4)2·6H2O, a synthetic arsenate. American Mineralogist, 93 (5) 928-939 doi:10.2138/am.2008.2750
Localities for Sainfeldite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Lapis 2002 (7/8) |
France | |
| P&T N°23-24 et al. (Haut-Rhin) |
Wittern et al. (Cologne) | |
Paul De Bondt | |
Pierre et Terre 1982 | |
| Pierrot (1964) |
Bari (1982) | |
This mine worked the same vein as Gabe ... +2 other references | |
| Pélisson et al. (1987) |
| Perroud (1989) |
Germany | |
| Kolitsch et al. (2000) |
| Carsten Slotta collection |
| Walenta (1992) |
| |
| |
Stephan Wolfsried collection | |
| Weiß (1990) |
Weiß (1990) | |
| Wittern (2001) |
| Stolze et al. (03/2021) |
| WITZKE (2018) |
| Hajek (2010) |
| Lapis 30 (7/8) |
Greece | |
| Kolitsch et al. (2014) |
Rieck et al. (1999) | |
Morocco | |
| Favreau et al. (2006) |
| Favreau et al. (2006) |
Font Philippe specimen | |
Favreau et al. (2006) | |
Favreau et al. (2006) | |
| Favreau et al. (2006) |
| sergio varvello |
Switzerland | |
| Stalder et al. (1998) +1 other reference |
USA | |
| www.excaliburmineral.com/mins-z.htm |
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Bauhaus, Nentershausen, Hersfeld-Rotenburg, Kassel Region, Hesse, Germany