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Fluorchegemite

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Formula:
Ca7(SiO4)3F2
Colour:
Colorless
Hardness:
5½ - 6
Specific Gravity:
2.91 (Calculated)
Crystal System:
Orthorhombic
Name:
For the mineral chegemite and its fluorine content.
F-dominant analogue of chegemite


Hide all sections | Show all sections

Classification of FluorchegemiteHide

Approved
Approval Year:
2012

Physical Properties of FluorchegemiteHide

Colour:
Colorless
Streak:
White
Hardness:
5½ - 6 on Mohs scale
Density:
2.91 g/cm3 (Calculated)

Optical Data of FluorchegemiteHide

Type:
Biaxial (-)
RI values:
nα = 1.610(2) nβ = 1.615(2) nγ = 1.619(2)
2V:
Measured: 80° , Calculated: 84°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v, weak
Pleochroism:
Non-pleochroic

Chemical Properties of FluorchegemiteHide

Formula:
Ca7(SiO4)3F2
IMA Formula:
Ca7(SiO4)3F2

Crystallography of FluorchegemiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 5.0620(1) Å, b = 11.3917(2) Å, c = 23.5180(3) Å
Ratio:
a:b:c = 0.444 : 1 : 2.064
Unit Cell V:
1356.16 ų
Z:
4
Morphology:
Irregular grains up to 0.2 mm.
Comment:
space group Pbnm

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.636 (52)
3.013 (57)
2.991 (56)
2.832 (51)
2.718 (63)
2.699 (46)
2.531 (100)
1.905 (95)

Type Occurrence of FluorchegemiteHide

General Appearance of Type Material:
Irregular grains up to 0.2 mm.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, catalogue number 4163/1
Geological Setting of Type Material:
An edgrewite-bearing zone of endoskarn at the contact of a large altered calciferous xenolith within ignimbrites of the Upper Chegem Caldera, Russia.
Associated Minerals at Type Locality:

Synonyms of FluorchegemiteHide

Relationship of Fluorchegemite to other SpeciesHide

Other InformationHide

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 FluorchegemiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Galuskina, I.O., Lazic, B., Galuskin, E.V., Armbruster, T., Gazeev, V.M., Włodyka, R., Zadov, A.E., Dulski, M., Dzierżanowski, P. (2012) Fluorchegemite, IMA 2011-112. CNMNC Newsletter No. 13, June 2012, page 812; Mineralogical Magazine, 76, 807-817.
Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.

Internet Links for FluorchegemiteHide

Localities for FluorchegemiteHide

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.
Russia
 
  • Northern Caucasus Region
    • Kabardino-Balkarian Republic
      • Baksan Valley
Galuskina, I.O., Lazic, B., Galuskin, E.V., Armbruster, T., Gazeev, V.M., Włodyka, R., Zadov, A.E., Dulski, M., Dzierżanowski, P. (2012) Fluorchegemite, IMA 2011-112. CNMNC Newsletter No. 13, June 2012, page 812; Mineralogical Magazine, 76, 807-817.
          • Lakargi Mt.
Galuskina, I.O., Lazic, B., Galuskin, E.V., Armbruster, T., Gazeev, V.M., Włodyka, R., Zadov, A.E., Dulski, M., Dzierżanowski, P. (2012) Fluorchegemite, IMA 2011-112. CNMNC Newsletter No. 13, June 2012, page 812; Mineralogical Magazine, 76, 807-817. ; Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.;
South Ossetia
 
  • Greater Caucasus Mountain Range
    • Kel’ volcanic area
      • Shadil-Khokh volcano
Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.
Mineral and/or Locality  
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