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Weilite

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Formula:
Ca(HAsO
 
4
)
System:TriclinicColour:White
Name:Named after René Weil (b. 1901), professor of mineralogy, University of Strasbourg (France).
Isostructural with:Monetite


White powdery surface alteration of haidingerite.

Classification of Weilite

IMA status:Approved 1963
Strunz 8th edition ID:7/A.12-20
Nickel-Strunz 10th (pending) edition ID:8.AD.10

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th edition ID:37.1.1.2
Dana 8th edition ID:37.1.1.2

37 : ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
1 : Miscellaneous
Hey's CIM Ref.: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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Type Occurrence of Weilite

Co-type Localities:Gabe Gottes Mine (incl. Giftgrube), Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France
Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany
Schneeberg District, Erzgebirge, Saxony, Germany
Year of Discovery:1963
Geological Setting of type material:Frequently post-mine and may be a coating on haidingerite or pharmacolite.

Physical Properties of Weilite

Lustre: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 (measured):3.48 g/cm3
Density (calculated):3.45 g/cm3

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
Unit Cell Volume:V 337.66 ų (Calculated from Unit Cell)
Z:4
Comment:AC (B) 26:403 (1970); also JCPDS 16-710 (synthetic)
X-Ray Powder Diffraction:
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
Maximum Birefringence:δ = 0.044

Chart 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(HAsO
 
4
)
Simplified for copy/paste:Ca(HAsO4)
Essential elements:As, Ca, H, O
All elements listed in formula:As, Ca, H, O

Relationship of Weilite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AD.05Nahpoite
Na
 
2
HPO
 
4
8.AD.10Monetite
Ca(HPO
 
4
)
8.AD.10Švenekite
Ca(H
 
2
AsO
 
4
)
 
2
8.AD.15Archerite
(K,NH
 
4
)(H
 
2
PO
 
4
)
8.AD.15Biphosphammite
(NH
 
4
,K)(H
 
2
PO
 
4
)
8.AD.20Phosphammite
(NH
 
4
)
 
2
(HPO
 
4
)
8.AD.25Buchwaldite
NaCa(PO
 
4
)
8.AD.30Schultenite
Pb(HAsO
 
4
)
8.AD.35Chernovite-(Y)
Y(AsO
 
4
)
8.AD.35Dreyerite
Bi(VO
 
4
)
8.AD.35Wakefieldite-(Ce)
Ce(VO
 
4
)
8.AD.35Wakefieldite-(Y)
Y(VO
 
4
)
8.AD.35Xenotime-(Y)
Y(PO
 
4
)
8.AD.35Pretulite
Sc(PO
 
4
)
8.AD.35Xenotime-(Yb)
(Yb,Y,HREE)(PO
 
4
)
8.AD.35Wakefieldite-(La)
La(VO
 
4
)
8.AD.40Pucherite
Bi(VO
 
4
)
8.AD.45Ximengite
Bi(PO
 
4
)
8.AD.50Gasparite-(Ce)
(Ce,REE)(AsO
 
4
)
8.AD.50Monazite-(Ce)
(Ce,La,Nd,Th)(PO
 
4
)
8.AD.50Monazite-(La)
(La,Ce,Nd)(PO
 
4
)
8.AD.50Monazite-(Nd)
(Nd,La,Ce)(PO
 
4
)
8.AD.50Rooseveltite
Bi(AsO
 
4
)
8.AD.50Cheralite
(Ca,Ce)(Th,Ce)(PO
 
4
)
 
2
8.AD.50Monazite-(Sm)
(Sm,Gd,Ce,Th)(PO
 
4
)
8.AD.50UM2005-35-VO:CaFePSiTh
(Th,Ca)(VO
 
4
,SiO
 
4
,PO
 
4
)
8.AD.55Tetrarooseveltite
Bi(AsO
 
4
)
8.AD.60Chursinite
(Hg
+
2
)
 
0.5
Hg
2+
 
(AsO
 
4
)
8.AD.65Clinobisvanite
Bi(VO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
20.2.1Bearsite
Be
 
2
(AsO
 
4
)(OH) · 4H
 
2
O
20.2.2Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
20.2.3Rösslerite
Mg(HAsO
 
4
) · 7H
 
2
O
20.2.4Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
20.2.6Johnbaumite
Ca
 
5
(AsO
 
4
)
 
3
OH
20.2.7Haidingerite
CaHAsO
 
4
· H
 
2
O
20.2.8Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
20.2.9Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.2.10Vladimirite
Ca
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH) · 4H
 
2
O
20.2.11Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
20.2.12Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 9H
 
2
O
20.2.13Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
· 10H
 
2
O
20.2.14Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
· 11H
 
2
O
20.2.15Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
· 4H
 
2
O
20.2.16Bergslagite
CaBeAsO
 
4
(OH)
20.2.17Adelite
CaMg(AsO
 
4
)(OH)
20.2.18Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
20.2.19Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.2.20Camgasite
CaMg(AsO
 
4
)(OH) · 5H
 
2
O
20.2.21Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 11H
 
2
O
20.2.22Bariopharmacosiderite
Ba
 
0.5
Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
· 5H
 
2
O
Related Minerals - Dana Grouping):

- +
37.1.1.1Monetite
Ca(HPO
 
4
)

Other Names for Weilite

Synonyms:
IMA1963-006
Other Languages:
German:Weilit
Russian:Вейлит
Spanish:Weilita

Other Information

Fluorescence in UV light:Not fluorescent.
Health Warning: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

Search Engines:
  • Look for Weilite on Google
  • Look for Weilite images on Google
  • External Links:
  • Look for Weilite on Webmineral
  • Look for Weilite on Athena Mineralogy
  • Look for Weilite on Wikipedia
  • Look for Weilite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Weilite details from Handbook of Mineralogy (PDF)
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  • Lapis Mineral Magazin
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  • Fabre Minerals - search for Weilite specimens
  • Buy fine minerals and gemstones from Pala International
  • Weilite specimens for sale - minfind.com
  • Find Weilite on www.crystalclassics.co.uk
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  • Localities for Weilite

    The 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. ? 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
    http://users.skynet.be/jose.dehove/photos/Hourt.htm
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mtns (Erzgebirge)
          • Jáchymov District (St Joachimsthal)
    Lapis 2002(7/8), 63-65
      • Ústí Region
        • Krušné Hory Mtns (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)
    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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