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Weberite Mineral Data
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General Weberite Information
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 Chemical Formula: |
Na2MgAlF7 |
| Composition: |
Molecular Weight = 230.25 gm |
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Sodium 19.97 % Na 26.92 % Na2O |
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Magnesium 10.56 % Mg 17.50 % MgO |
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Aluminum 11.72 % Al 22.14 % Al2O3 |
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Fluorine 57.76 % F 57.76 % F |
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- %
F -24.32 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na2MgAlF7 |
| Environment: |
With cryolite and other fluorides. |
| IMA Status: |
Valid Species (Pre-IMA) 1938 |
| Locality: |
Ivigtut, Greenland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Theobald C. F. Weber (1823-1886), one of the founders of the cryolite industry in Denmark. |
| Name Pronunciation: |
Weberite  |
| Synonym: |
ICSD 33507 |
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PDF 5-733 |
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Weberite Image |
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Images:
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Images:
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Jorgensenite Weberite
Comments: SEM image of polished section of aluminofluoride vein mounted in epoxy. Bladed jorgensenite (Jor), barite (Bar) and weberite (Web) with minor quartz, bøgvadite, schorl, pyrite, galena, chalcopyrite and chalcocite.
Location: Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Firth, Arsuk, Kitaa (West Greenland) Province, Greenland.
Scale: See Image.
© Pavel M. Kartashov |
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Weberite Crystallography
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| Axial Ratios: |
a:b:c =0.7059:1:0.7303 |
| Cell Dimensions: |
a = 7.06, b = 10, c = 7.303, Z = 4; V = 515.59 Den(Calc)= 2.97 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: I mma |
| X Ray Diffraction: |
By Intensity(I/Io): 1.779(1), 2.89(0.9), 2.95(0.9), |
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Physical Properties of Weberite
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| Cleavage: |
{101} Poor, {010} Indistinct |
| Color: |
Greenish, Gray, Grayish white, White. |
| Density: |
2.96 |
| Diaphaneity: |
Translucent |
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Weberite
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| Optical Data: |
Biaxial (+), a=1.346, b=1.348, g=1.35, bire=0.0040, 2V(Calc)=88, 2V(Meas)=83. |
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Calculated Properties of Weberite
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| Electron Density: |
Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Weberite =2.97 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEWeberite = 1.18 barns/electron
U=PEWeberite x rElectron Density= 3.36 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weberite is Not Radioactive |
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Weberite Classification
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| Dana Class: |
11.06.13.01 (11)Halide Complexes; Alumino-fluorides |
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(11.06)with miscellaneous formulae |
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(11.06.13)Dana Group |
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11.06.13.01 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m |
| Strunz Class: |
03.CB.25 03 - HALIDES |
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03.C - Complex Halides |
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03.CB -Neso-aluminofluorides |
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03.CB.25 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m |
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Other Weberite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Weberite :
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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Weberite Specimen Label here :
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Weberite
Na2MgAlF7
Dana No: 11.06.13.01 Strunz No: 03.CB.25
Locality:
Notes:
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