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Filatovite

Pictures (1 Images total)

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-Oblast, Sibirien, Russland; Ein Produkt fumarolischer Aktivitäten
Copyright: Collector; Contribution: Collector
Collection: Collector
Location: Russland/Ferner Osten, Föderationskreis/Kamtschatka, Krai/Milkowski (Milkovsky), Rajon/Tolbachik-Vulkan-Feld/Große Spalteneruption (Great Fissure)
Mineral: Filatovite
Encyclopedia: Mineralienportrait/Feldspat
Image: 1197700516
Rating: 6.5 (votes: 4)
License: Usage for Mineralienatlas project only
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-Feld / Milkowski (Milkovsky), Rajon / Kamtschatka, Krai / 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

Volume (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

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

Other languages

German

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

Locations with GPS information

IDs

GUSID (Global unique identifier short form) R7uA7wC9C02cyoCk6r9rTg
GUID (Global unique identifier) EF80BB47-BD00-4D0B-9CCA-80A4EABF6B4E
Database ID 1222