Weilite Mineral Data + 
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- 37.1.1.1 Monetite CaHPO4 P1 1
- 37.1.1.2 Weilite CaHAsO4 P1 1
- VII/A.12-10 Monetite CaHPO4 P1 1
- VII/A.12-20 Weilite CaHAsO4 P1 1
- VII/A.12-30 Phosphammite (NH4)2HPO4 P 21/c 2/m
- VII/A.12-40 Biphosphammite (NH4,K)H2PO4 I 42d 4 2m
- VII/A.12-50 Archerite (K,NH4)H2PO4 I 42d 4 2m
- VII/A.12-60 Olgite Na(Sr,Ba)PO4 P 3 3
- VII/A.12-70 Bario-olgite! Na(Ba,Sr,Na,REE)PO4 P 3 3
General Weilite Information |
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 Chemical Formula: |
CaHAsO4 | ||
| 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 | |||
| Empirical Formula: |
CaH(AsO4) | ||
| Environment: |
Secondary mineral in oxidized As-rich veins, usually an alteration product of pharmacolite and haidingerite. | ||
| IMA Status: |
Approved IMA 1963 | ||
| Locality: |
Schneeberg, Saxony, Germany. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Rene Weil (1901-), mineralogist of Strasbourg, France, known for his study of Alsatian minerals. | ||
| Synonym: |
ICSD 16039 | ||
| PDF 16-701 | |||
Weilite Image | |||
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Images:
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Weilite Crystallography |
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| Axial Ratios: |
a:b:c =1.0244:1:1.0302 | ||
| 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 | ||
| Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.05(1), 3.43(1), 2.79(0.7), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Weilite |
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| Cleavage: |
None | ||
| Color: |
White. | ||
| Density: |
3.48 | ||
| Diaphaniety: |
Porcelanous | ||
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. | ||
| Habit: |
Powdery - Forms a loose, poorly-coherent pulverulent mass. | ||
| Luster: |
Greasy (Oily) | ||
| Streak: |
white | ||
Optical Properties of Weilite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=3.33 gm/cc |
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| Fermion Index |
Fermion Index = 0.00047 Boson Index = 0.99953 |
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| Photoelectric: |
PEWeilite = 31.07 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Weilite is Not Radioactive |
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Weilite Classification |
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| Dana Class: |
37.1.1.2 (37)Anhydrous Acid Phosphates, etc | ||
| (37.1)with miscellaneous formulae | |||
| (37.1.1)Dana Group | |||
| Strunz Class: |
VII/A.12-20 VII - Phosphates, Arsenates and Vanadates | ||
| VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre | |||
| VII/A.12 - Monetite - Schultenite series | |||
Other Weilite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Weilite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris Search for Weilite using: Visit our Advertisers for Weilite : Translate Weilite Mineral Data : Ask about Weilite here : Print or Cut-and-Paste your Weilite Specimen Label here :
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