Weilite
A valid IMA mineral species
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About Weilite
Formula:
Ca(HAsO4)
Colour:
White
Lustre:
Waxy, Greasy, Dull
Specific Gravity:
3.48
Crystal System:
Triclinic
Name:
Named after René Weil (1901-1983), professor of mineralogy, University of Strasbourg (France).
Co-Type Localities:
Isostructural with:
Unique Identifiers
Mindat ID:
4259
Long-form identifier:
mindat:1:1:4259:4
Similar Names
IMA Classification of Weilite
Approved
IMA Formula:
Ca(As5+O3OH)
Approval year:
1963
First published:
1963
Classification of Weilite
8.AD.10
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th ed.:
37.1.1.2
37.1.1.2
37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
20.2.5
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 for Standard |
|---|---|---|
| Wei | 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 Weilite
Waxy, Greasy, Dull
Transparency:
Translucent
Comment:
may be affected by underlying mineral
Colour:
White
Streak:
White
Comment:
Fine-grained natures prevents measurement.
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
3.48 g/cm3 (Measured) 3.45 g/cm3 (Calculated)
Optical Data of Weilite
Type:
Biaxial (-)
RI values:
nα = 1.644 nγ = 1.688
2V:
Measured: 81°
Birefringence:
0.044
Max. Birefringence:
δ = 0.044
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:
relatively strong
Optical Extinction:
X ∧ {001} = 20°; Y ∧ {001} = 27°; Z ⊥ {001} = 34°.
Chemistry of Weilite
Mindat Formula:
Ca(HAsO4)
Element Weights:
Elements listed:
Crystallography of Weilite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 7.059 Å, b = 6.891 Å, c = 7.201 Å
α = 97.43°, β = 103.55°, γ = 87.75°
α = 97.43°, β = 103.55°, γ = 87.75°
Ratio:
a:b:c = 1.024 : 1 : 1.045
Unit Cell V:
337.66 ų (Calculated from Unit Cell)
Z:
4
Comment:
AC (B) 26:403 (1970); also JCPDS 16-710 (synthetic)
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) |
|---|---|---|---|---|---|---|---|
| 0009369 | Weilite | Ferraris G, Chiari G (1970) The crystal structure of CaHAsO4 (weilite) Acta Crystallographica B26 403-409 |  | 1970 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.55 Å | (60) |
| 3.48 Å | (50) |
| 3.43 Å | (100) |
| 3.22 Å | (50) |
| 3.05 Å | (100) |
| 2.79 Å | (70) |
| 2.60 Å | (50) |
| 2.29 Å | (60) |
Comments:
JCPDS 16-710 (synthyetic)
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 Weilite
Co-Type Localities:
General Appearance of Type Material:
Incrustrations or pseudomorphs after pharmacolite or haidingerite.
Place of Conservation of Type Material:
National School of Mines, Paris, France, 4073.
National Museum of Natural History, Washington, D.C., USA, R5543.
National Museum of Natural History, Washington, D.C., USA, R5543.
Geological Setting of Type Material:
Frequently post-mine and may be a coating on haidingerite or pharmacolite.
Associated Minerals at Type Locality:
Synonyms of Weilite
Other Language Names for Weilite
Common Associates
Associations Based on Photo Data:
| 8 photos of Weilite associated with Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
| 7 photos of Weilite associated with Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
| 7 photos of Weilite associated with Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
| 6 photos of Weilite associated with Orpiment | As2S3 |
| 4 photos of Weilite associated with Realgar | As4S4 |
| 3 photos of Weilite associated with Pharmacolite | Ca(HAsO4) · 2H2O |
| 2 photos of Weilite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 2 photos of Weilite associated with Annabergite | Ni3(AsO4)2 · 8H2O |
| 2 photos of Weilite associated with Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| 1 photo of Weilite associated with Hörnesite | Mg3(AsO4)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
| 8.AD. | 'Unnamed (Monoclinic polymorph of ximengite)' | Bi(PO4) |
| 8.AD. | Keplerite | Ca9(Ca0.5◻0.5)Mg(PO4)7 |
| 8.AD. | Mazorite | Ba3(PO4)2 |
| 8.AD. | Deynekoite | Ca9◻Fe3+(PO4)7 |
| 8.AD. | Monazite-(Gd) | Gd(PO4) |
| 8.AD.05 | Nahpoite | Na2(PO3OH) |
| 8.AD.10 | Švenekite | Ca(H2AsO4)2 |
| 8.AD.10 | Monetite | Ca(PO3OH) |
| 8.AD.15 | Archerite | (K,NH4)(H2PO4) |
| 8.AD.15 | Biphosphammite | NH4(H2PO4) |
| 8.AD.20 | Phosphammite | (NH4)2(PO3OH) |
| 8.AD.25 | Buchwaldite | NaCa(PO4) |
| 8.AD.30 | Schulténite | Pb(HAsO4) |
| 8.AD.35 | Dreyerite | Bi(VO4) |
| 8.AD.35 | Wakefieldite-(La) | La(VO4) |
| 8.AD.35 | Anningite-(Ce) | (Ca0.5Ce4+0.5)(VO4) |
| 8.AD.35 | Pretulite | Sc(PO4) |
| 8.AD.35 | Wakefieldite-(Ce) | Ce(VO4) |
| 8.AD.35 | Wakefieldite-(Y) | Y(VO4) |
| 8.AD.35 | Xenotime-(Yb) | Yb(PO4) |
| 8.AD.35 | 'Chernovite-(Ce)' | (Ce,Y)(AsO4) |
| 8.AD.35 | Xenotime-(Gd) | Gd(PO4) |
| 8.AD.35 | Chernovite-(Y) | Y(AsO4) |
| 8.AD.35 | Xenotime-(Y) | Y(PO4) |
| 8.AD.35 | Wakefieldite-(Nd) | Nd(VO4) |
| 8.AD.40 | Pucherite | Bi(VO4) |
| 8.AD.45 | Ximengite | Bi(PO4) |
| 8.AD.50 | 'UM2005-35-VO:CaFePSiTh' | (Th,Ca)(VO4,SiO4,PO4) |
| 8.AD.50 | Rooseveltite | Bi(AsO4) |
| 8.AD.50 | Gasparite-(Ce) | Ce(AsO4) |
| 8.AD.50 | Monazite-(Sm) | Sm(PO4) |
| 8.AD.50 | Monazite-(Ce) | Ce(PO4) |
| 8.AD.50 | Monazite-(La) | La(PO4) |
| 8.AD.50 | Monazite-(Nd) | Nd(PO4) |
| 8.AD.50 | Gasparite-(La) | La(AsO4) |
| 8.AD.50 | Cheralite | CaTh(PO4)2 |
| 8.AD.55 | Tetrarooseveltite | Bi(AsO4) |
| 8.AD.60 | Chursinite | [Hg2]2+Hg2+2[AsO4]2 |
| 8.AD.65 | Clinobisvanite | Bi(VO4) |
| 8.AD.70 | Gurimite | Ba3(VO4)2 |
| 8.AD.75 | Picaite | NaCa[AsO3OH][AsO2(OH)2] |
Fluorescence of Weilite
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 Weilite
mindat.org URL:
https://www.mindat.org/min-4259.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Weilite
Reference List:
Herpin, Paulette; Pierrot, Roland (1963) La weilite, CaH (AsO4), un nouvel arséniate de calcium isomorphe de la monétite. Bulletin de la Société française de Minéralogie et de Cristallographie, 86 (4). 368-372 doi:10.3406/bulmi.1963.5666
Localities for Weilite
Showing 29 localities.
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.
Canada | |
| Percival |
Chile | |
| XRD and Wet Chemical by Gerhard Möhn |
China | |
| Zhu et al. (2015) +1 other reference |
Czech Republic | |
| Hloušek et al. (2002) |
| Pauliš |
France | |
| Bari (1982) |
| Wittern +2 other references |
| Bari (1982) | |
| This mine worked the same vein as Gabe ... +2 other references | |
Germany (TL) | |
| Herpin et al. (1963) |
| Walenta (1992) |
| |
| Walenta (1992) |
| Weiß (1990) |
| Haas (n.d.) | |
| Witzke (1992) |
| Herpin et al. (1963) |
| Wittern (2001) |
| Haake et al. (1994) |
Morocco | |
| Favreau et al. (2006) |
Switzerland | |
| Stalder et al. (1998) +1 other reference |
UK | |
| A.W.G.Kingsbury probable fraud |
USA | |
| Travis Olds collection |
| Mineralogical Society of America - ... |
| Castor et al. (2004) | |
| Bowell et al. (2005) +1 other reference | |
| - (2005) | |
| Barrick Gold Corporation | |
| - (2005) |
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Wittichen, Schenkenzell, Rottweil, Freiburg Region, Baden-Württemberg, Germany