Phaunouxite
A valid IMA mineral species
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About Phaunouxite
Formula:
Ca3(AsO4)2 · 11H2O
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
2.28
Crystal System:
Triclinic
Name:
Named after Phaunoux, the French name for the Rauenthal valley (France), where the mineral was first found.
Unique Identifiers
Mindat ID:
3186
Long-form identifier:
mindat:1:1:3186:4
IMA Classification of Phaunouxite
Classification of Phaunouxite
8.CJ.40
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
40.3.12.1
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
20.2.14
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 |
|---|---|---|
| Pnx | 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 Phaunouxite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Density:
2.28(2) g/cm3 (Measured) 2.275 g/cm3 (Calculated)
Optical Data of Phaunouxite
Type:
Biaxial (+)
RI values:
nα = 1.532 nβ = 1.542 nγ = 1.556
2V:
Measured: 80° , Calculated: 82°
Max. Birefringence:
δ = 0.024
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
weak
Chemistry of Phaunouxite
Mindat Formula:
Ca3(AsO4)2 · 11H2O
Element Weights:
Elements listed:
Crystallography of Phaunouxite
Crystal System:
Triclinic
Cell Parameters:
a = 12.563(7) Å, b = 12.181(6) Å, c = 6.205(4) Å
α = 88.94(3)°, β = 91.67(3)°, γ = 113.44(3)°
α = 88.94(3)°, β = 91.67(3)°, γ = 113.44(3)°
Ratio:
a:b:c = 1.031 : 1 : 0.509
Unit Cell V:
870.80 ų (Calculated from Unit Cell)
Morphology:
Acicular crystals, with forms {100} and {010}.
Comment:
Non-standard setting.
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0009785 | Phaunouxite | Catti M, Ivaldi G (1983) On the topotactic dehydration Ca3(AsO4)2*11H2O (phaunouxite) -> Ca3(AsO4)2*10H2O (rauenthalite), and the structures of both minerals Acta Crystallographica B39 4-10 |  | 1983 | Sainte Marie-aux-Mines, Alsace, France | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.49 Å | (100) |
| 6.23 Å | (90) |
| 5.42 Å | (80) |
| 3.276 Å | (90) |
| 2.963 Å | (60) |
| 2.810 Å | (60) |
| 2.443 Å | (70) |
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 Phaunouxite
General Appearance of Type Material:
Acicular 1.5 mm crystals, often in fan-shaped aggregates.
Place of Conservation of Type Material:
Ecole Nationale Supérieure des Mines, Paris, France, number 51361 (holotype).
National Museum of Natural History, Washington, D.C., USA, number 142221 (cotype).
Laboratoire de Minéralogie, Université Louis Pasteur, Strasbourg, France (type).
Université Torino, Torino, Italy (type).
National Museum of Natural History, Washington, D.C., USA, number 142221 (cotype).
Laboratoire de Minéralogie, Université Louis Pasteur, Strasbourg, France (type).
Université Torino, Torino, Italy (type).
Associated Minerals at Type Locality:
Synonyms of Phaunouxite
Other Language Names for Phaunouxite
German:Phaunouxit
Russian:Фонуксит
Common Associates
Associated Minerals Based on Photo Data:
| 37 photos of Phaunouxite associated with Rauenthalite | Ca3(AsO4)2 · 10H2O |
| 8 photos of Phaunouxite associated with Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
| 4 photos of Phaunouxite associated with Scorodite | Fe3+AsO4 · 2H2O |
| 4 photos of Phaunouxite associated with Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
| 3 photos of Phaunouxite associated with Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
| 3 photos of Phaunouxite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 3 photos of Phaunouxite associated with Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
| 2 photos of Phaunouxite associated with Pharmacolite | Ca(HAsO4) · 2H2O |
| 1 photo of Phaunouxite associated with Calcite | CaCO3 |
| 1 photo of Phaunouxite associated with Aragonite | CaCO3 |
Related Minerals - Strunz-mindat Grouping
| 8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
| 8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
| 8.CJ. | Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CJ. | Caesiumpharmacosiderite | CsFe4[(AsO4)3(OH)4] · 4H2O |
| 8.CJ. | Jeankempite | Ca5(AsO4)2(HAsO4)2 · 7H2O |
| 8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
| 8.CJ.10 | Swaknoite | (NH4)2Ca(PO3OH)2 · H2O |
| 8.CJ.10 | Mundrabillaite | (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 | Rhabdophane-(Y) | YPO4 · H2O |
| 8.CJ.25 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
| 8.CJ.27 | Churchite-(Dy) | (Dy,Sm,Gd,Nd)PO4 · 2H2O |
| 8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
| 8.CJ.35 | Fulbrightite | Ca(VO)2(AsO4)2 · 4H2O |
| 8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
| 8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
| 8.CJ.45 | Brockite | (Ca,Th,Ce)PO4 · H2O |
| 8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
| 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 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
| 8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
| 8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
| 8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
| 8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
| 8.CJ.50 | Ardealite | Ca2(PO3OH)(SO4) · 4H2O |
| 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 |
Other Information
Notes:
At room temperature, phaunouxite dehydrates slowly to rauenthalite.
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 Phaunouxite
mindat.org URL:
https://www.mindat.org/min-3186.html
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References for Phaunouxite
Localities for Phaunouxite
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.
Austria | |
| Taucher et al. (1994) |
Czech Republic | |
| Jakub Plasil |
| www.mineralos.cz (2002) |
France | |
| Bari (1982) |
| Bari et al. (1982) +1 other reference |
| Bari (1982) | |
| This mine worked the same vein as Gabe ... +2 other references | |
Germany | |
| Kolitsch (1995) +2 other references |
| Carsten Slotta collection (XRD-analysed by Uwe Kolitsch) |
| Belendorff (2021) |
| Weiß (1990) |
| Weiß (1990) | |
| |
| Witzke (1992) |
Ireland | |
| S. MORETON et al. (1999) |
Japan | |
| OHNISHI et al. (2013) +1 other reference |
Slovakia | |
| Martin Števko-unpublished |
| Martin Števko-unpublished +1 other reference | |
UK | |
|
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Dionýz mine, Zemberg-Terézia vein system, Dobšiná mining district, Dobšiná, Rožňava District, Košice Region, Slovakia