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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Rotation
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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
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.
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