Mineralogy Database

Weilite Mineral Data

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General Weilite Information

Help on Chemical  Formula: Chemical Formula: CaHAsO4
Help on Composition: Composition: Molecular Weight = 180.01 gm
   Calcium   22.26 %  Ca   31.15 % CaO
   Arsenic   41.62 %  As   63.84 % As2O5
   Hydrogen   0.56 %  H     5.00 % H2O
   Oxygen    35.55 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaH(AsO4)
Help on Environment: Environment: Secondary mineral in oxidized As-rich veins, usually an alteration product of pharmacolite and haidingerite.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: Schneeberg, Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Rene Weil (1901-), mineralogist of Strasbourg, France, known for his study of Alsatian minerals.
Help on Name Pronunciation: Name Pronunciation: Weilite Say WEILITE
Help on Synonym: Synonym: ICSD 16039
  PDF 16-701

Weilite Image

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Comments: White, radial aggregates weilite on matrix.
Location: Schlema, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Weilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0244:1:1.0302
Help on Cell Dimensions: Cell Dimensions: a = 7.11, b = 6.94, c = 7.15, Z = 4; alpha = 94.32°, beta = 101.6°, gamma = 87.37° V = 344.25 Den(Calc)= 3.47
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.05(1), 3.43(1), 2.79(0.7),

Physical Properties of Weilite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 3.48
Help on Diaphaneity: Diaphaneity: Porcelanous
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Powdery - Forms a loose, poorly-coherent pulverulent mass.
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: white

Optical Properties of Weilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1923,KPDmeas= 0.1918,KC= 0.1859
Ncalc = 1.64 - 1.65
Help on Optical Data: Optical Data: Biaxial (-), a=1.644, b=1.67, g=1.688, bire=0.0440, 2V(Calc)=78, 2V(Meas)=82.

Calculated Properties of Weilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Weilite =3.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0004720717
Boson Index = 0.9995279283
Help on Photoelectric: Photoelectric: PEWeilite = 31.07 barns/electron
U=PEWeilite x rElectron Density= 103.30 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weilite is Not Radioactive

Weilite Classification

Help on  Dana Class: Dana Class: (37)Anhydrous Acid Phosphates, etc
  (37.01)with miscellaneous formulae
  (37.01.01)Dana Group Monetite CaHPO4 P1 1 Weilite CaHAsO4 P1 1
Help on  Strunz Class: Strunz Class: 08.AD.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
08.AD.10 Monetite CaHPO4 P1 1
08.AD.10 Weilite CaHAsO4 P1 1
08.AD.10 Svenekite! Ca(H2AsO4)2 P1 1

Other Weilite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Weilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.AD.10





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