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Weberite

A valid IMA mineral species - grandfathered
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About WeberiteHide

02559380014947128588902.jpg
Theobald Weber
Formula:
Na2Mg[AlF6]F
Colour:
Grayish white; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.96
Crystal System:
Orthorhombic
Name:
Named after Theobald Christian Fridrich Weber (September 13, 1823, København - September 3, 1886 Svendborg), a founder of the Danish cryolite industry in 1857.
This page provides mineralogical data about Weberite.


Unique IdentifiersHide

Mindat ID:
4253
Long-form identifier:
mindat:1:1:4253:2
GUID
(UUID V4):
2ec0e438-1b4e-4788-bde0-3ac919655364

IMA Classification of WeberiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Na2MgAlF7
First published:
1938

Classification of WeberiteHide

3.CB.25

3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
11.6.13.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
8.6.8

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
WebIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of WeberiteHide

Vitreous
Transparency:
Translucent
Colour:
Grayish white; colourless in transmitted light.
Streak:
White
Hardness:
3½ on Mohs scale
Cleavage:
Poor/Indistinct
On {101} poor; on {010} indistinct.
Fracture:
Irregular/Uneven
Density:
2.96 g/cm3 (Measured)    2.966 g/cm3 (Calculated)

Optical Data of WeberiteHide

Type:
Biaxial (+)
RI values:
nα = 1.344 - 1.346 nβ = 1.346 - 1.348 nγ = 1.347 - 1.350
2V:
Measured: 83° (3), Calculated: 88°
Max Birefringence:
δ = 0.003 - 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemistry of WeberiteHide

Mindat Formula:
Na2Mg[AlF6]F

Crystallography of WeberiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Immm
Cell Parameters:
a = 7.31 Å, b = 7.06 Å, c = 9.99 Å
Ratio:
a:b:c = 1.035 : 1 : 1.415
Unit Cell V:
515.57 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Irregular grains and masses. Inclusions in cryolite.
Twinning:
With [111] as twin axis and {011} as composition plane, commonly as contact twins.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0013477WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0293
0013478WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0133
0013479WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0293
0013480WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0133
0013481WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0293
0013482WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0133
0013483WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0293
0013484WeberiteKnop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-2211982Ivigtut, Greenland0133
0015669WeberiteGiuseppetti G, Tadini C (1978) Re-examination of the crystal structure of weberite Tschermaks Mineralogische und Petrographische Mitteilungen 25 57-621978Ivigtut, Greenland0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
1.779 Å(100)
2.95 Å(90)
2.89 Å(90)
5.05 Å(60)
5.89 Å(50)
2.30 Å(50)
1.542 Å(50)

Geological EnvironmentHide

Type Occurrence of WeberiteHide

General Appearance of Type Material:
Orregular grains, to 2.5 mm, in fluorite or cryolite.
Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark, 1981.936
Geological Setting of Type Material:
Cryolite deposit and overlying pegmatite.
Associated Minerals at Type Locality:

Other Language Names for WeberiteHide

German:Weberit
Spanish:Weberita

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Weberite associated with QuartzSiO2
6 photos of Weberite associated with GearksutiteCa[Al(F,OH)5(H2O)]
6 photos of Weberite associated with SericiteKAl2(AlSi3O10)(OH)2
6 photos of Weberite associated with FluoriteCaF2
6 photos of Weberite associated with MuscoviteKAl2(AlSi3O10)(OH)2
5 photos of Weberite associated with BaryteBaSO4
5 photos of Weberite associated with CryoliteNa2NaAlF6
5 photos of Weberite associated with JørgenseniteNa2(Sr,Ba)14Na2Al12F64(OH,F)4
4 photos of Weberite associated with PyriteFeS2
4 photos of Weberite associated with TopazAl2(SiO4)(F,OH)2

Related Minerals - Strunz-mindat GroupingHide

3.CB.05CryolithioniteNa3Al2(LiF4)3Iso. m3m (4/m 3 2/m) : Ia3d
3.CB.15CryoliteNa2NaAlF6Mon. 2/m
3.CB.15ElpasoliteK2NaAlF6Iso. m3 (2/m 3) : Pa3
3.CB.15SimmonsiteNa2LiAlF6Mon.
3.CB.20ColquiriiteCaLi[AlF6]Trig.
3.CB.25LeonardseniteMgAlF5 · 2H2O Orth. mmm (2/m 2/m 2/m) : Imma
3.CB.30KarasugiteSrCa[Al(F,OH)7]Mon. 2/m : P21/b
3.CB.35UsoviteBa2CaMgAl2F14Mon. 2/m : B2/b
3.CB.40PachnoliteNaCa[AlF6] · H2OMon. 2/m
3.CB.40ThomsenoliteNaCa[AlF6] · H2OMon. 2/m : P21/b
3.CB.45CarlhintzeiteCa2[AlF6]F · H2OTric.
3.CB.50YaroslaviteCa3Al2F10(OH)2 · H2OOrth.
3.CB.55SbacchiiteCa2AlF7Orth. mmm (2/m 2/m 2/m) : Pnma
3.CB.60VerneiteNa2Ca3Al2F14Iso. 2 3 : I21 3

Other InformationHide

Notes:
Slightly soluble in water. Readily soluble in an AlCl3 solution.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for WeberiteHide

References for WeberiteHide

Reference List:

Localities for WeberiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Western Antarctica
    • Antarctic Peninsula
      • South Shetland Islands
Australia
 
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
  • Tasmania
    • Waratah-Wynyard municipality
      • Waratah district
        • Waratah
Finland
 
  • Kymenlaakso
    • Kotka
Greenland (TL)
 
  • Sermersooq
    • Arsuk Fjord
Kazakhstan
 
  • East Kazakhstan Region
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Russia
 
  • Zabaykalsky Krai
    • Kalarsky District
Ukraine
 
  • Zhytomyr Oblast
    • Korosten Raion
USA
 
  • Colorado
    • Boulder County
      • Jamestown Mining District
    • El Paso County
      • Cheyenne Mining District (St. Peters Dome Mining District)
        • St Peters Dome
    • Fremont County
  • Nevada
    • Mineral County
      • Fitting Mining District
        • Gillis Range
 
Mineral and/or Locality  
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