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Fluormayenite

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Formula:
Ca12Al14O32F2
Colour:
Colourless
Lustre:
Vitreous
Hardness:
5½ - 6
Crystal System:
Isometric
Name:
For the composition and analogy to chlormayenite
The fluorine analogue of chlormayenite and vacancy analogue of fluorkyuygenite.

The structure is based on microporous tetrahedra framework, with 1/3 of the structural cages are occupied by fluorine.


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Classification of FluormayeniteHide

Approved

Physical Properties of FluormayeniteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Comment:
In places with greenish or yellowish tint
Streak:
White
Hardness:
5½ - 6 on Mohs scale
Hardness:
VHN50=771 kg/mm2 - Vickers

Optical Data of FluormayeniteHide

Type:
Isotropic
RI values:
n = 1.612(3)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate
Type:
Isotropic

Chemical Properties of FluormayeniteHide

Formula:
Ca12Al14O32F2
IMA Formula:
Ca12Al14O32[◻4F2]
Common Impurities:
Fe(III),Na

Crystallography of FluormayeniteHide

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
I4 3d
Setting:
I4 3d
Cell Parameters:
a = 11.9894(2) Å
Unit Cell V:
1723.42 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.895(92)
2.997(47)
2.681(100)
2.447(43)
2.189(41)
1.945(27)
1.663(33)
1.602(37)
Comments:
From Type Description.

Type Occurrence of FluormayeniteHide

General Appearance of Type Material:
crystals, usually < 20 μm in size
Place of Conservation of Type Material:
Type material is deposited in the collections of the collections of the Museum of Natural History in Bern, Bernastrasse 5, CH-3005 Bern, Switzerland, catalogue number NMBE- 42094
Geological Setting of Type Material:
larnite-rich pyrometamorphic roks
Associated Minerals at Type Locality:

Synonyms of FluormayeniteHide

Relationship of Fluormayenite to other SpeciesHide

Other Members of this group:
ChlorkyuygeniteCa12Al14O32[(H2O)4Cl2]Iso. 4 3m
ChlormayeniteCa12Al14O32[◻4Cl2]Iso. 4 3m : I4 3d
FluorkyuygeniteCa12Al14O32[(H2O)4F2]Iso. 4 3m : I4 3d

Fluorescence of FluormayeniteHide

Does not show fluorescence

Other InformationHide

Thermal Behaviour:
molecular water is released at 400oC
Notes:
Raman bands [cm-1]: 320 (ν2 AlO4), 520 (ν4 AlO4); 700, 770 (ν1 AlO4)
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for FluormayeniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Williams, P. P. (1968): Crystal structure of a fluoride derivative of 12CaO.7Al2O3. J. Amer. Ceram. Soc. 51, 531.
Williams, P. P. (1973): Refinement of the structure of 11CaO.7Al2O3.CaF2. Acta Crystallogr., B29, 1550-1551.
Galuskin, E.V., Gfeller, F., Armbruster, T., Galuskina, I.O., Vapnik, Y., Murashko, M. and Dzierz˙anowski, P. (2013) Fluormayenite, IMA 2013-019. CNMNC Newsletter No. 16, August 2013, page 2705; Mineralogical Magazine, 77, 2695-2709.
Galuskin, E.V., Gfeller, F., Armbruster, T., Sharygin, V.V., Galuskina, I.O., Krivovichev, S.V., Vapnik, Y., Murashko, M., Dzierżanowski, P., Wirth, R. (2015): Mayenite supergroup, part III: Fluormayenite, Ca12Ala14aO32[□4F2], and fluorkyuygenite, Ca12Al14O32[(H2O)4F2], two new minerals from pyrometamorphic rocks of the Hatrurim Complex, South Levant. European Journal of Mineralogy, 27, 123-136.

Internet Links for FluormayeniteHide

Localities for FluormayeniteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Jordan
 
  • Amman
    • Hashem region
      • Lisdan-Siwaga Fault
        • Siwaga
Khoury, H.N., Sokol, E.V., Kokh, S.N., Seryotkin, Y.V., Nigmatulina, E.N., Goryainov, S.V., Belogub, E.V., Clark, I.D. (2016): Tululite, Ca14(Fe3+,Al)(Al,Zn,Fe3+,Si,P,Mn,Mg)15O36: a new Ca zincate-aluminate from combustion metamorphic marbles, central Jordan. Mineralogy and Petrology, 110, 125-140; Sokol, E. V., Kokh, S. N., Khoury, H. N., Seryotkin, Y. V., & Goryainov, S. V. (2016). Long-term immobilisation of Cd 2+ at the Tulul Al Hammam natural analogue site, central Jordan. Applied Geochemistry, 70, 43-60.
Palestine (TL)
 
  • West Bank
    • Hatrurim Formation
Galuskin, E.V., Gfeller, F., Armbruster, T., Galuskina, I.O., Vapnik, Y., Murashko, M. and Dzierz˙anowski, P. (2013) Fluormayenite, IMA 2013-019. CNMNC Newsletter No. 16, August 2013, page 2705; Mineralogical Magazine, 77, 2695-2709.; Galuskin, E.V., Gfeller, F., Armbruster, T., Sharygin, V.V., Galuskina, I.O., Krivovichev, S.V., Vapnik, Y., Murashko, M., Dzierżanowski, P., Wirth, R. (2015): Mayenite supergroup, part III: Fluormayenite, Ca12Al14O32[□4F2], and fluorkyuygenite, Ca12Al14O32[(H2O)4F2], two new minerals from pyrometamorphic rocks of the Hatrurim Complex, South Levant. European Journal of Mineralogy, 27, 123-136.
Mineral and/or Locality  
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