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Fluorannite

Collectors Summary

Color eisenschwarz
Streak color grau
Hardness (Mohs) 3.00 - 3.50
Cleavages vollkommen {001}
Crystal System monoklin, C2/m

Chemism

Chemical formula

KFe32+[(F,OH)2|AlSi3O10]

Chemical composition

Aluminium, Eisen, Silicium, Fluor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 514.867631575 u; Number of atoms in the formula: 20.5

Info

Empirical formula:

KFe3[(F0.75(OH)0.25)2AlSi3O10]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.10

0.5

2.44

1.0079470

0.5039735

Oxygen

O

32.63

10.5

51.22

15.9994300

167.9940150

Fluorine

F

5.53

1.5

7.32

18.9984033

28.4976049

Aluminium

Al

5.24

1

4.88

26.9815382

26.9815382

Silicon

Si

16.36

3

14.63

28.0855300

84.2565900

Potassium

K

7.59

1

4.88

39.0983100

39.0983100

Iron

Fe

32.54

3

14.63

55.8452000

167.5356000

Analysis wt%

SiO2 : 34.12, TiO2 : 1.29, Al2O3 : 13.89, Fe2O3 : 7.86, FeO : 26.19, MgO : 1.49, MnO : 0.68, Li2O : 0.47, BaO : 0.44, K2O : 8.73, Rb2O : 0.42, F : 3.91, H2O : 0.91 (Ref: Acta Petrol.Min.2000)

Strunz 9th edition incl. updates

9.EC.20

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
20:Phlogopit-Gruppe

Lapis Classification

VIII/H.11-105

VIII: SILIKATE
H: Schichtsilikate
11: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Lithionit/Biotit-Reihe

Classification by Hölzel

9.ED.145

9: SILICATES
E: Phyllosilicates
D: Biotite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Mica group  ⇒ True micas

Optical Properties

Color

eisenschwarz

Streak color

grau

max. Birefringence

0.052

Birefringence chart\! Fluorannite title=Birefringence chart Fluorannite

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

1.596

RI value β

1.648

RI value γ / ε

1.648

Ri mean

1.631

2V angle

Biaxial (-) 0°~

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

5.369

Cell parameters b (Å)

9.289

Cell parameters c (Å)

10.153

Cell parameters a/b or c/a

0.578

Cell parameters c/b

1.093

Cell parameters α

90°

Cell parameters β

100.48

Cell parameters γ

90°

Z

2

Volumne (ų)

497.91

X-Ray Powder Diffraction

10.09(100),
5.02(10),
3.336(60),
3.160(10),
2.933(10),
2.649(10),
2.507(10),
2.004(10)

XRD chart Fluorannite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.00 - 3.50

VHN (Hardness Vickers)

109 (g nicht angegeben)

Density (g/cm³)

3.17 (gemessen)

3.434 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Tenacity

schneidbar

Preface

Author (Name, Year)

Shen & Lu & Xu, 2000

References

Acta Petrologica et Mineralogica (in Chinese); = Yanshi Kuangwuxue Zashi 19 (2000), 356

IMA group assignments

Other languages

German

Fluorannit

Spanish

Fluorannita

English

Fluorannite

French

Fluorannite

Russian

Фтораннит

Simplified Chinese

氟铁云母

Japanese

フローランナイト

CNMNC (IMA)-Number

IMA 1999-048

CNMNC symbol

Symbol

Fann

Locations with GPS information

IDs

GUSID (Global unique identifier short form) gX-V4tMTFES3f6oM3wnpaw
GUID (Global unique identifier) E2957F81-13D3-4414-B77F-AA0CDF09E96B
Database ID 1243