Weberite Mineral Data

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General Weberite Information

Chemical Formula:

Na2MgAlF7

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

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

PDF 5-733

Weberite Image

Images:

Weberite Cryolite

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

Images:

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I mma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.779(1), 2.89(0.9), 2.95(0.9),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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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

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

Optical Properties of Weberite

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

Electron Density:

Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Weberite =2.97 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Weberite= 1.18 barns/electron
U=PE_Weberite x rElectron Density= 3.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weberite is Not Radioactive

Weberite Classification

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

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

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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Ask about Weberite here :
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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: