Weberite Mineral Data

Weberite Mineral Data
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General Weberite Information

Help on Chemical Formula: Chemical Formula: Na2MgAlF7
Help on Composition: Composition: Molecular Weight = 230.25 gm
   Sodium     19.97 %  Na   26.92 % Na2O
   Magnesium  10.56 %  Mg   17.50 % MgO
   Aluminum   11.72 %  Al   22.14 % Al2O3
   Fluorine   57.76 %  F    57.76 % F
                -   %   F   -24.32 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2MgAlF7
Help on Environment: Environment: With cryolite and other fluorides.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1938
Help on Locality: Locality: Ivigtut, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Theobald C. F. Weber (1823-1886), one of the founders of the cryolite industry in Denmark.
Help on Name Pronunciation: Name Pronunciation: Weberite Say WEBERITE
Help on Synonym: Synonym: ICSD 33507
  PDF 5-733
 

Weberite Image

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Weberite   Cryolite

Comments: Gray weberite masses in white cryolite.
Location: Ivigtut, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Weberite   Jorgensenite

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

Weberite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.7059:1:0.7303
Help on Cell Dimensions: Cell Dimensions: a = 7.06, b = 10, c = 7.303, Z = 4; V = 515.59 Den(Calc)= 2.97
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I mma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.779(1), 2.89(0.9), 2.95(0.9),
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Giuseppetti G , Tadini C , Tschermaks Mineralogische und Petrographische Mitteilungen , 25 (1978) p.57-62, Re-examination of the crystal structure of weberite, Locality: Ivigtut, Greenland

 

Physical Properties of Weberite

Help on Cleavage: Cleavage: {101} Poor, {010} Indistinct
Help on Color: Color: Greenish, Gray, Grayish white, White.
Help on Density: Density: 2.96
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Weberite

Help on Optical Data: Optical Data: Biaxial (+), a=1.346, b=1.348, g=1.35, bire=0.0040, 2V(Calc)=88, 2V(Meas)=83.
 

Calculated Properties of Weberite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Weberite =2.97 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEWeberite = 1.18 barns/electron
U=PEWeberite x rElectron Density= 3.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weberite is Not Radioactive
 

Weberite Classification
Help on Dana Class: Dana Class: 11.06.13.01 (11)Halide Complexes; Alumino-fluorides
  (11.06)with miscellaneous formulae
  (11.06.13)Dana Group
 
11.06.13.01 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 03.CB.25 03 - HALIDES
  03.C - Complex Halides
  03.CB -Neso-aluminofluorides
 
03.CB.25 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m
 

Other Weberite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Ask about Weberite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Weberite Specimen Label here :

Weberite

Na2MgAlF7
Dana No: 11.06.13.01 Strunz No: 03.CB.25
Locality:

 

Notes: