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Weilite

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Formula:
Ca(HAsO4)
System:
Triclinic
Colour:
White
Name:
Named after René Weil (b. 1901), professor of mineralogy, University of Strasbourg (France).
Isostructural with:
White powdery surface alteration of haidingerite.

Classification of Weilite

Approved 1963
8.AD.10

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
20.2.5

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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http://www.mindat.org/min-4259.html
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First Recorded Occurrence of Weilite

Year of Discovery:
1963
Geological Setting of First Recorded Material:
Frequently post-mine and may be a coating on haidingerite or pharmacolite.

Physical Properties of Weilite

Waxy, Greasy, Dull
Diaphaneity (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)

Crystallography of Weilite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Space Group Setting:
P1
Cell Parameters:
a = 7.059Å, b = 6.891Å, c = 7.201Å
α = 97.43°, β = 103.55°, γ = 87.75°
Ratio:
a:b:c = 1.024 : 1 : 1.045
Z:
4
Comment:
AC (B) 26:403 (1970); also JCPDS 16-710 (synthetic)
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.55 (60)
3.48 (50)
3.43 (100)
3.22 (50)
3.05 (100)
2.79 (70)
2.60 (50)
2.29 (60)
Comments:
JCPDS 16-710 (synthyetic)

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
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong
Optical Extinction:
X ^ {001} = 20 degrees; Y ^ {001} = 27 degrees; Z perpendicular to {001} = 34 degrees.

Chemical Properties of Weilite

Formula:
Ca(HAsO4)
Essential elements:
All elements listed in formula:

Relationship of Weilite to other Species

8.AD.05NahpoiteNa2HPO4
8.AD.10MonetiteCa(HPO4)
8.AD.10ŠvenekiteCa(H2AsO4)2
8.AD.15Archerite(K,NH4)(H2PO4)
8.AD.15Biphosphammite(NH4,K)(H2PO4)
8.AD.20Phosphammite(NH4)2(HPO4)
8.AD.25BuchwalditeNaCa(PO4)
8.AD.30SchultenitePb(HAsO4)
8.AD.35Chernovite-(Y)Y(AsO4)
8.AD.35DreyeriteBi(VO4)
8.AD.35Wakefieldite-(Ce)Ce(VO4)
8.AD.35Wakefieldite-(Y)Y(VO4)
8.AD.35Xenotime-(Y)Y(PO4)
8.AD.35PretuliteSc(PO4)
8.AD.35Xenotime-(Yb)(Yb,Y,HREE)(PO4)
8.AD.35Wakefieldite-(La)La(VO4)
8.AD.40PucheriteBi(VO4)
8.AD.45XimengiteBi(PO4)
8.AD.50Gasparite-(Ce)(Ce,REE)(AsO4)
8.AD.50Monazite-(Ce)(Ce,La,Nd,Th)(PO4)
8.AD.50Monazite-(La)(La,Ce,Nd)(PO4)
8.AD.50Monazite-(Nd)(Nd,La,Ce)(PO4)
8.AD.50RooseveltiteBi(AsO4)
8.AD.50Cheralite(Ca,Ce)(Th,Ce)(PO4)2
8.AD.50Monazite-(Sm)(Sm,Gd,Ce,Th)(PO4)
8.AD.50UM2005-35-VO:CaFePSiTh(Th,Ca)(VO4,SiO4,PO4)
8.AD.55TetrarooseveltiteBi(AsO4)
8.AD.60Chursinite(Hg2+)0.5Hg2+(AsO4)
8.AD.65ClinobisvaniteBi(VO4)
20.2.1BearsiteBe2(AsO4)(OH) · 4H2O
20.2.2BrassiteMg(HAsO4) · 4H2O
20.2.3RössleriteMg(HAsO4) · 7H2O
20.2.4HörnesiteMg3(AsO4)2 · 8H2O
20.2.6JohnbaumiteCa5(AsO4)3OH
20.2.7HaidingeriteCaHAsO4 · H2O
20.2.8PharmacoliteCa(HAsO4) · 2H2O
20.2.9SainfelditeCaCa2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.2.10VladimiriteCa4(AsO4)2(AsO3OH) · 4H2O
20.2.11GuériniteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.12FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.13RauenthaliteCa3(AsO4)2 · 10H2O
20.2.14PhaunouxiteCa3(AsO4)2 · 11H2O
20.2.15McneariteNaCa5(AsO4)(HAsO4)4 · 4H2O
20.2.16BergslagiteCaBeAsO4(OH)
20.2.17AdeliteCaMg(AsO4)(OH)
20.2.18TalmessiteCa2Mg(AsO4)2 · 2H2O
20.2.19IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2O
20.2.20CamgasiteCaMg(AsO4)(OH) · 5H2O
20.2.21PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
20.2.22BariopharmacosideriteBa0.5Fe43+(AsO4)3(OH)4 · 5H2O

Other Names for Weilite

Name in Other Languages:
German:Weilit
Russian:Вейлит
Spanish:Weilita

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.

References for Weilite

Reference List:
Herpin P., Pierrot R. (1963), La weilite, CaH(AsO4), un nouvel arseniate de calcium isomorphe de la monetite. Bulletin de la Société française de Minéralogie et de Cristallographie: 86: 368-372.

American Mineralogist (1964): 49: 816.

Abbona F., Ferraris G. (1970), Contributo alla conoscenza di minerali arsenicali; nota II: ricerche sulla disidratazione della weilite, della haidingerite e della pharmacolite. Periodico di mineralogia – Roma, 183-204.

Acta Crystallographica: B26: 403-410.

Internet Links for Weilite

Localities for Weilite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Belgium
 
  • Luxembourg Province
    • Stavelot Massif
      • Vielsalm
        • Grand Halleux
Canada
 
  • Ontario
    • Timiskaming District
      • Cobalt-Gowganda region
        • Cobalt area
          • Coleman Township
Percival, J. B., Kwong, Y. J., Dumaresq, C., & Michel, F. Distribution of As, Ni and Co in Tailings and Surface Waters in the Cobalt Area, Ontario.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
Lapis 2002(7/8), 63-65
    • Ústí Region
      • Krušné Hory Mts (Erzgebirge)
        • Klášterec nad Ohří
Pauliš, P., Civiš, S., Smutný, Z.: Weilit z Měděnce v Krušných horách. Minerál, 2011, roč. 19, č. 3, s. 217-219.
France
 
  • Alsace
    • Haut-Rhin
      • Ste Marie-aux-Mines (Markirch)
        • Neuenberg
Wittern, Journée: "Mineralien finden in den Vogesen", von Loga (Cologne), 1997
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
P. Herpin & R. Pierrot (1963): La weilite, CaH(AsO4), un nouvel arseniate de calcium isomorphe de la monetite.- Bull. Soc. franc. Miner. Crist. 86, 368-372
          • Böckelsbach valley
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
          • Burgfelsen
No reference listed
          • Heubach Valley
K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
  • Hesse
    • Richelsdorf District
      • Bauhaus
P Haas collection
      • Süss
        • Richelsdorf Smelter
S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
  • Saxony
    • Erzgebirge
      • Marienberg District
        • Wolkenstein
Haake, R., Flach, S., Bode, R. (1994): Mineralien und Fundstellen Deutschland, Teil 2, S.71-75.
      • Schlema-Hartenstein District
T. Witzke (1992) Mineralien-Welt 3(6), 16-18
P. Herpin & R. Pierrot (1963): La weilite, CaH(AsO4), un nouvel arseniate de calcium isomorphe de la monetite.- Bull. Soc. franc. Miner. Crist. 86, 368-372
        • Neustädtel
Wittern: "Mineralfundorte in Deutschland", 2001
Morocco
 
  • Souss-Massa-Draâ Region
    • Ouarzazate Province
      • Tazenakht
        • Bou Azer District (Bou Azzer District)
          • Bou Azer
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
Switzerland
 
  • Wallis (Valais)
    • Anniviers Valley
      • Ayer
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 378.; Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer)
UK
 
  • England
    • Cumbria
      • North and Western Region (Cumberland)
        • Threlkeld District
          • St John's in the Vale
BMS Database
USA
 
  • Nevada
    • Humboldt Co.
      • Osgood Mts
        • Potosi District
          • Adam Peak
Handbook of Mineralogy
NBMG Spec. Pub. 31 Minerals of Nevada
      • Potosi District
        • Adam Peak
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia
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