Weberite Mineral Data

(Translated by https://www.hiragana.jp/)
Weberite Mineral Data

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, bÃ¸gvadite, 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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Weberite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Weberite :

A Bijoux Google Search for Weberite
Adam's Minerals Google Search for Weberite
Cape Minerals Google Search for Weberite
Dakota Matrix Minerals Google Search for Weberite
Excalibur Mineral Corp. Google Search for Weberite
Exceptional Minerals Google Search for Weberite
John Betts Fine Minerals Search for Weberite
McDougall Minerals Google Search for Weberite
Mineral News Website Link
Rock and Mineral Shows Google Search for Weberite
Weinrich Minerals, Inc. Google Search for Weberite

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: