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Fluorchegemite (Fluorchegemit)

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 5.5 - 6
Crystal System orthorhombisch, Pbnm
Morphology unregelmäßige Körner bis 2 mm

Chemism

Chemical formula

Ca7(SiO4)3F2

Empirical formula (analysis)

(Ca7.01Mg0.01)Σ7.02(Si2.98Ti4+0.01)Σ2.99O12[F1.40(OH)0.60]Σ2.00

Additional chem. information

F-dominantes Analog von Chegemit

Chemical composition

Calcium, Silicium, Fluor, Sauerstoff

Unit weight: 594.16153575 u; Number of atoms in the formula: 24.61

Info

Empirical formula:

(Ca7.01Mg0.01)(Si2.98Ti0.01)O12[F1.40(OH)0.60]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.10

0.6

2.44

1.0079470

0.6047682
Oxygen

O

33.93

12.6

51.20

15.9994300

201.5928180
Fluorine

F

4.48

1.4

5.69

18.9984033

26.5977646
Magnesium

Mg

0.04

0.01

0.04

24.3050600

0.2430506
Silicon

Si

14.09

2.98

12.11

28.0855300

83.6948794
Calcium

Ca

47.29

7.01

28.48

40.0784000

280.9495840
Titanium

Ti

0.08

0.01

0.04

47.8671000

0.4786710

Analysis wt%

SiO2 : 30.31, CaO : 66.00, F : 6.39 (Ref: berechnet)

Strunz 9th edition incl. updates

9.AF.55

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in [4], [5] und/oder nur [6] Koordination
55:Klinohumit-Gruppe

Lapis Classification

VIII/B.04-094

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
4: Kationen in tetraedrischer oder oktaedrischer Koordination [4/6]; Humit-Gruppe

Classification by Hölzel

9.AI.265

9: SILICATES
A: Nesosilicates
I: Nesosilicates with OH
2: Norbergite-Group

IMA status

anerkannt - März 2012 - CNMNC Newsletter No. 13, June 2012, page 808; Mineralogical Magazine, 76, 807-817

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.009
Birefringence chart\! Fluorchegemite title=Birefringence chart Fluorchegemite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

α = 1.610(2)

RI value β

β = 1.6150(2)

RI value γ / ε

γ = 1.619(2)

Ri mean

1.614

2V angle

Biaxial(-) 80(8)° (gemessen) 84° (berechnet)

Dispersion

schwach; r > v

Pleochroism

keiner

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell parameters a (Å)

5.062

Cell parameters b (Å)

11.392

Cell parameters c (Å)

23.518

Cell parameters a/b or c/a

0.444

Cell parameters c/b

2.064

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1356.196

Crystal structure

Struktur bestimmt

X-Ray Powder Diffraction

3.636(52), 3.013(57), 2.991(56), 2.832(51), 2.718(63), 2.699(46), 2.531(100), 1.905(95)
XRD chart Fluorchegemite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

unregelmäßige Körner bis 2 mm

Physical Properties

Hardness (Mohs)

5.5 - 6

VHN (Hardness Vickers)

480 - 511 (50g)

Density (g/cm³)

2.91 (berechnet)

2.91 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Russland/Nordkaukasus, Föderationskreis/Kabardino-Balkarien, Republik/Obere vulkanische Chegem-Struktur (Verkhnechegemskaya Caldera)

Type material

Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia

Collection number of type material

4163/1

Paragenesis of type material

Fluorchegemit is assoziert mit hochtemperatur Mineralien Larnit, Edgrewit, Wadalit, Eltyubyuit, Rondorfit, Lakargiit, Th-reichem Kerimasit und mit ihren Alterungsprodukten wie Bultfonteinit, Killalait, Hillebrandit, Afwillit, Trabzonit und Jennit.

Preface

Author (Name, Year)

I.O. Galuskina, B. Lazic, E.V. Galuskin, T. Armbruster, V.M. Gazeev, R. Włodyka, A.E. Zadov, M. Dulski and P. Dzierżanowski (2012)

References

CNMNC Newsletter No. 13, June 2012, page 808; 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 edgrewite-bearing andoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardino-Balkaria, Russia - Occurrence, Crystal structure, and new data on the mineral assemblages. Canadian Mineralogist, 53, 325-344.

Other languages

German

Fluorchegemit

English

Fluorchegemite

Russian

Фторчегемит

CNMNC (IMA)-Number

IMA 2011-112

CNMNC symbol

Symbol

Fcgm

Locations with GPS information

IDs

GUSID (Global unique identifier short form) fOOnCvU9pEOIxr2iLOGEbg
GUID (Global unique identifier) 0AA7E37C-3DF5-43A4-88C6-BDA22CE1846E
Database ID 7391