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Filatovite

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Filatovit
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Filatovit

Gut ausgebildeter, ca. 2,2 cm großer verzwillingter farbloser (durch Asche verdunkelter) Einzelkristall; Fundort: Zweiter Aschekegel der Großen Spalteneruption des Vulkans Tolbachik, Kamchatka-Obla...
Collection: Collector
Copyright: Collector
Contribution: Collector 2007-12-15
Locality: Große Spalteneruption (Great Fissure) / Tolbachik-Vulkan / Kamtschatka Oblast / Ferner Osten, Föderationskreis / Russland

Collectors Summary

Color farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5 - 6
Cleavages gut (100)
Crystal System monoklin, I2/c

Chemism

Chem­ical formula

K[(Al,Zn)2(As,Si)2O8]

Chem­ical com­po­si­tion

Aluminium, Arsen, Silicium, Zink, Kalium, Sauerstoff

Unit weight: 366.6959253 u; Number of atoms in the formula: 13

Info

Empirical formula:

K[(Al0.75Zn0.25)2(As0.75Si0.25)2O8]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

34.91

8

61.54

15.9994300

127.9954400
Aluminium

Al

11.04

1.5

11.54

26.9815382

40.4723073
Silicon

Si

3.83

0.5

3.85

28.0855300

14.0427650
Potassium

K

10.66

1

7.69

39.0983100

39.0983100
Zinc

Zn

8.92

0.5

3.85

65.4094000

32.7047000
Arsenic

As

30.65

1.5

11.54

74.9216020

112.3824030

Anal­y­sis wt%

Ø P2O5 : 1.63, As2O5 : 40.60, SiO2 : 12.35, Al2O3 : 27.33, ZnO : 3.85, CuO : 0.83, Na2O : 0.63, K2O : 12.85 (Ref: European Journal of Mineralogy 2004)

Strunz 9th edi­tion incl. updates

8.AC.85

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
C: Mit mittelgroßen und großen [Kationen]
85:Filatovit-Gruppe

Lapis Clas­sifica­tion

VIII/J.07-110

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
7: Ohne tetraederfremde Anionen; Feldspat-Gruppe

Clas­sifica­tion by Hölzel

9.FC.190

9: SILICATES
F: Tektosilicates
C: Feldspar-Group

Dana 8th edi­tion

76.01.01.08

76: Tektosilicates Tectosilicate Al-Si Framework
01: Tektosilicates Tectosilicate Al-Si Framework with Al-Si frameworks
01: K (Na,Ba) feldspars

IMA sta­tus

anerkannt 2002

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

 Feldspar group

Optical Properties

Color

farblos

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

Lus­tre

Glasglanz

max. Birefrin­gence

0.004
Birefringence chart\! Filatovite title=Birefringence chart Filatovite

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

1.532

RI value β

1.535

RI value γ / ε

1.537

Ri mean

1.535

2V angle

Biaxial (-) 60°

Optical Data Luminescence

Lumi­nes­cence

keine Fluoreszenz bekannt

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

I2/c

Cell param­e­ters a (Å)

8.772

Cell param­e­ters b (Å)

13.370

Cell param­e­ters c (Å)

14.690

Cell param­e­ters a/b or c/a

0.656

Cell param­e­ters c/b

1.099

Cell param­e­ters α

90°

Cell param­e­ters β

115.95

Cell param­e­ters γ

90°

Z

8

Volumne (ų)

1549.161

X-Ray Pow­der Diffrac­tion

4.329(70),
3.897(70),
3.364(100),
3.300(50),
3.066(40),
2.981(60),
2.646(40),
1.836(30)
XRD chart Filatovite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5 - 6

VHN (Hard­ness Vick­ers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.92

3.144 ( ρ calc. Mineralienatlas )

Cleav­ages

gut (100)

Tenac­ity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Ferner Osten, Föderationskreis/Kamtschatka Oblast/Tolbachik-Vulkan/Große Spalteneruption (Great Fissure)/nördlicher Bruch/zweiter Schlackenkegel

Preface

Occurrences

Vulkanisches Exhalationsprodukt

Rare­ness

sehr selten

Name from

Prof. S. K. Filatov (1940– ) von St Petersburg

Author (Name, Year)

Vergasova & Krivovichev & Britvin & Burns & Ananiev, 2004

Col­lector informa­tion

Benannt nach Prof. S.K. Filatov; St. Petersburg; für seine Beiträge zur Chemie der Exhalationsmineralien.

Addi­tional Informa­tion

Tektosilikat; Feldspat-Gruppe; Anorthoklas-Anorthit-Banalsit-serie; das erste Arsenat der Feldspatgruppe.

References

European Journal of Mineralogy 16 (2004), 533-536.

American Mineralogist 90 (2005), 518.

IMA group assignments

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Filatovite

K[(Al,Zn)2(As,Si)2O8]

monoklin : 2/m : I2/c

8.AC.85

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

'Anorthoclase'

(Na,K)AlSi3O8

triklin : 1 : C1

VIII/J.07-010

Albite

NaAlSi3O8

triklin : 1 : C1

VIII/J.07-020

'Oligoclase'

(Na,Ca)(Si,Al)4O8

triklin : 1 : C1

VIII/J.07-030

'Andesine'

(Na,Ca)(Si,Al)4O8

triklin : 1 : P1

VIII/J.07-040

'Labradorite'

(Ca,Na)(Si,Al)4O8

triklin : 1 : C1

VIII/J.07-050

'Bytownite'

(Ca,Na)(Si,Al)4O8

triklin : 1 : I1

VIII/J.07-060

Anorthite

CaAl2Si2O8

triklin : 1 : P1

VIII/J.07-070

Dmisteinbergite

CaAl2Si2O8

hexagonal : 6/mmm : P6/mmm

VIII/J.07-075

Lingunite

(Na,Ca)AlSi3O8

tetragonal : 4/m : I4/m

VIII/J.07-078

Kumdykolite

NaAlSi3O8

orthorhombisch : mm2 oder mmm : P2nn oder Pmnn

VIII/J.07-079

Svyatoslavite

CaAl2Si2O8

orthorhombisch : 222 : P21212

VIII/J.07-080

Stronalsite

SrNa2Al4Si4O16

orthorhombisch : mm2 : Iba2

VIII/J.07-090

Banalsite

BaNa2Al4Si4O16

orthorhombisch : mm2 : Iba2

VIII/J.07-100

Filatovite

K[(Al,Zn)2(As,Si)2O8]

monoklin : 2/m : I2/c

VIII/J.07-110

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Orthoclase

KAlSi3O8

monoklin : 2/m : C2/m

9.FC.100

'Adularia' (Var.v. Orthoclase)

9.FC.105

Sanidine

(K,Na)(Si,Al)4O8

monoklin : 2/m : C2/m

9.FC.110

Buddingtonite

(NH4)AlSi3O8·0.5 H2O

monoklin : 2, 2/m : P21, P21/m

9.FC.140

'Hyalophane'

(K,Ba)Al(Si,Al)3O8

monoklin : 2/m : C2/m

9.FC.160

Celsian

BaAl2Si2O8

monoklin : 2/m : I2/c

9.FC.180

Filatovite

K[(Al,Zn)2(As,Si)2O8]

monoklin : 2/m : I2/c

9.FC.190

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Orthoclase

KAlSi3O8

monoklin : 2/m : C2/m

 76.01.01.01

Sanidine

(K,Na)(Si,Al)4O8

monoklin : 2/m : C2/m

 76.01.01.02

Celsian

BaAl2Si2O8

monoklin : 2/m : I2/c

 76.01.01.04

Microcline

KAlSi3O8

triklin : 1 : C1

 76.01.01.05

Rubicline

(Rb,K)[AlSi3O8]

triklin : 1 : P1

 76.01.01.07

Filatovite

K[(Al,Zn)2(As,Si)2O8]

monoklin : 2/m : I2/c

 76.01.01.08

Buddingtonite

(NH4)AlSi3O8·0.5 H2O

monoklin : 2, 2/m : P21, P21/m

 76.01.02.01

'Oligoclase'

(Na,Ca)(Si,Al)4O8

triklin : 1 : C1

 76.01.03.02

'Andesine'

(Na,Ca)(Si,Al)4O8

triklin : 1 : P1

 76.01.03.03

'Labradorite'

(Ca,Na)(Si,Al)4O8

triklin : 1 : C1

 76.01.03.04

Anorthite

CaAl2Si2O8

triklin : 1 : P1

 76.01.03.06

Reedmergnerite

NaBSi3O8

triklin : 1 : C1

 76.01.04.01

Paracelsian

BaAl2Si2O8

monoklin : 2/m : P21/a

 76.01.05.01

Banalsite

BaNa2Al4Si4O16

orthorhombisch : mm2 : Iba2

 76.01.06.01

Stronalsite

SrNa2Al4Si4O16

orthorhombisch : mm2 : Iba2

 76.01.06.02

Lisetite

Na2CaAl4Si4O16

orthorhombisch : mm2 : Pbc21

 76.01.06.03

Svyatoslavite

CaAl2Si2O8

orthorhombisch : 222 : P21212

 76.01.06.04

Dmisteinbergite

CaAl2Si2O8

hexagonal : 6/mmm : P6/mmm

 76.01.07.01

Kokchetavite

KAlSi3O8

hexagonal : 6/mmm : P6/mmm

 76.01.08.01

CNMNC (IMA)-Number

IMA 2002-052

CNMNC symbol

Symbol

Ftv

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