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Filatovite

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Filatovit
Views (Image: 1197700516): 1605, Rating: 6.5
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

 
Feldspar group
 
 
 

 
 
Alkali feldspar
 
 
 

 
 
 
Anorthoclase ?
(Na,K)AlSi3O8
triklin
C1

 
 
 
Buddingtonite
(NH4)AlSi3O8·0.5 H2O
monoklin
P21, P21/m

 
 
 
Celsian
BaAl2Si2O8
monoklin
I2/c

 
 
 
Hyalophane
(K,Ba)Al(Si,Al)3O8
monoklin
C2/m

 
 
 
Microcline
KAlSi3O8
triklin
C1

 
 
 
Orthoclase
KAlSi3O8
monoklin
C2/m

 
 
 
Rubicline
(Rb,K)[AlSi3O8]
triklin
P1

 
 
 
Sanidine
(K,Na)(Si,Al)4O8
monoklin
C2/m

 
 
Banalsite
BaNa2Al4Si4O16
orthorhombisch
Iba2

 
 
Dmisteinbergite
CaAl2Si2O8
hexagonal
P6/mmm

 
 
Filatovite
K[(Al,Zn)2(As,Si)2O8]
monoklin
I2/c

 
 
Kokchetavite
KAlSi3O8
hexagonal
P6/mmm

 
 
Lingunite
(Na,Ca)AlSi3O8
tetragonal
I4/m

 
 
Paracelsian
BaAl2Si2O8
monoklin
P21/a

 
 
Plagioclase
 
 
 

 
 
 
Albite
NaAlSi3O8
triklin
C1

 
 
 
Andesine
(Na,Ca)(Si,Al)4O8
triklin
P1

 
 
 
Anorthite
CaAl2Si2O8
triklin
P1

 
 
 
Bytownite
(Ca,Na)(Si,Al)4O8
triklin
I1

 
 
 
Labradorite
(Ca,Na)(Si,Al)4O8
triklin
C1

 
 
 
Oligoclase
(Na,Ca)(Si,Al)4O8
triklin
C1

 
 
Reedmergnerite
NaBSi3O8
triklin
C1

 
 
Slawsonite
(Sr,Ca)Al2Si2O8
monoklin
P21/a

 
 
Stronalsite
SrNa2Al4Si4O16
orthorhombisch
Iba2

 
 
Svyatoslavite
CaAl2Si2O8
orthorhombisch
P21212

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Actuality: 07. Jul 2022 - 13:17:54

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Filatovit

English

Filatovite

Russian

Филатовит

Traditional Chinese

費拉托夫石

Simplified Chinese

费拉托夫石

CNMNC (IMA)-Number

IMA 2002-052

CNMNC symbol

Symbol

Ftv

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