Weberite (original) (raw)

A valid IMA mineral species - grandfathered

About WeberiteHide

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Colour:

Grayish white; colourless in transmitted light.

Crystal System:

Orthorhombic

Name:

Named after Theobald Christian Fridrich Weber (13 September 1823, Copenhagen, Denmark - 3 September 1886, Svendborg, Denmark), a founder of the Danish cryolite industry in 1857.

This page provides mineralogical data about Weberite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4253:2

2ec0e438-1b4e-4788-bde0-3ac919655364

IMA Classification of WeberiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Classification of WeberiteHide

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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

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

Physical Properties of WeberiteHide

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Colour:

Grayish white; colourless in transmitted light.

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

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RI values:

_n_α = 1.344 - 1.346 _n_β = 1.346 - 1.348 _n_γ = 1.347 - 1.350

2V:

Measured: 83° (3), Calculated: 88°

δ = 0.003 - 0.004

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of WeberiteHide

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Mindat Formula:

Na2Mg[AlF6]F

Crystallography of WeberiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

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)

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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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of WeberiteHide

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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

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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

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References for WeberiteHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.127-128

Localities for WeberiteHide

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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

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- 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.