Weberite
A valid IMA mineral species - grandfathered
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About Weberite
Formula:
Na2Mg[AlF6]F
Colour:
Grayish white; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
3½
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.
Type Locality:
This page provides mineralogical data about Weberite.
Unique Identifiers
Mindat ID:
4253
Long-form identifier:
mindat:1:1:4253:2
GUID
(UUID V4):
(UUID V4):
2ec0e438-1b4e-4788-bde0-3ac919655364
IMA Classification of Weberite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Na2MgAlF7
First published:
1938
Classification of Weberite
3.CB.25
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
11.6.13.1
11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
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
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Web | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Weberite
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.
On {101} poor; on {010} indistinct.
Fracture:
Irregular/Uneven
Density:
2.96 g/cm3 (Measured) 2.966 g/cm3 (Calculated)
Optical Data of Weberite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Chemistry of Weberite
Mindat Formula:
Na2Mg[AlF6]F
Elements listed:
Crystallography of Weberite
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 Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0013477 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 293 | |
0013478 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 133 | |
0013479 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 293 | |
0013480 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 133 | |
0013481 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 293 | |
0013482 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 133 | |
0013483 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 293 | |
0013484 | Weberite | Knop O, Cameron T S, Jochem K (1982) What is the true space group of weberite? Journal of Solid State Chemistry 43 213-221 | 1982 | Ivigtut, Greenland | 0 | 133 | |
0015669 | Weberite | Giuseppetti G, Tadini C (1978) Re-examination of the crystal structure of weberite Tschermaks Mineralogische und Petrographische Mitteilungen 25 57-62 | 1978 | Ivigtut, Greenland | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks | |
36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Weberite
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 Weberite
Common Associates
Associated Minerals Based on Photo Data:
7 photos of Weberite associated with Quartz | SiO2 |
6 photos of Weberite associated with Gearksutite | Ca[Al(F,OH)5(H2O)] |
6 photos of Weberite associated with Sericite | KAl2(AlSi3O10)(OH)2 |
6 photos of Weberite associated with Fluorite | CaF2 |
6 photos of Weberite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
5 photos of Weberite associated with Baryte | BaSO4 |
5 photos of Weberite associated with Cryolite | Na2NaAlF6 |
5 photos of Weberite associated with Jørgensenite | Na2(Sr,Ba)14Na2Al12F64(OH,F)4 |
4 photos of Weberite associated with Pyrite | FeS2 |
4 photos of Weberite associated with Topaz | Al2(SiO4)(F,OH)2 |
Related Minerals - Strunz-mindat Grouping
3.CB.05 | Cryolithionite | Na3Al2(LiF4)3 |
3.CB.15 | Cryolite | Na2NaAlF6 |
3.CB.15 | Elpasolite | K2NaAlF6 |
3.CB.15 | Simmonsite | Na2LiAlF6 |
3.CB.20 | Colquiriite | CaLi[AlF6] |
3.CB.25 | Leonardsenite | MgAlF5 · 2H2O |
3.CB.30 | Karasugite | SrCa[Al(F,OH)7] |
3.CB.35 | Usovite | Ba2CaMgAl2F14 |
3.CB.40 | Pachnolite | NaCa[AlF6] · H2O |
3.CB.40 | Thomsenolite | NaCa[AlF6] · H2O |
3.CB.45 | Carlhintzeite | Ca2[AlF6]F · H2O |
3.CB.50 | Yaroslavite | Ca3Al2F10(OH)2 · H2O |
3.CB.55 | Sbacchiite | Ca2AlF7 |
3.CB.60 | Verneite | Na2Ca3Al2F14 |
Other Information
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 Weberite
mindat.org URL:
https://www.mindat.org/min-4253.html
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References for Weberite
Reference List:
Localities for Weberite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Antarctica | |
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Australia | |
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Finland | |
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Greenland (TL) | |
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Kazakhstan | |
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Russia | |
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Ukraine | |
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USA | |
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Ivigtut Mine, Arsuk Fjord, Sermersooq, Greenland