Filatovite Mineral Data

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General Filatovite Information

Chemical Formula:

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

Composition:

Molecular Weight = 340.02 gm

Potassium 10.58 % K 12.74 % K₂O

Sodium 0.47 % Na 0.64 % Na₂O

Aluminum 14.36 % Al 27.14 % Al₂O₃

Zinc 3.08 % Zn 3.83 % ZnO

Iron 0.16 % Fe 0.21 % FeO

Copper 0.75 % Cu 0.94 % CuO

Silicon 5.78 % Si 12.37 % SiO₂

Arsenic 26.44 % As 40.56 % As₂O₅

Phosphorus 0.73 % P 1.67 % P₂O₅

Oxygen 37.64 % O

______ ______

100.00 % 100.09 % = TOTAL OXIDE

Empirical Formula:

K_0.92Na_0.07Al_1.81Zn_0.16Cu_0.04Fe²⁺_0.01As_1.2Si_0.7P_0.08O₈

Environment:

A product of fumarolic activity. Gas temperatures in the fumarole were ~410 to 420° C. As-dominant Feldspar group; structure determined.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

The second cinder cone of the North Breach of Great fissure Tolbachik eruption (GFTE), Kamchatka Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Stanislav K. Filatov (b. 1940), Professor, Department of Crystallography, St. Petersburg State University, St. Petersburg, Russia.

Synonym:

IMA2002-052

Filatovite Image

Images:

Filatovite

Comments: Colorless prismatic single crystal embedded in epoxy, co-type material.
Location: Great Tolbachik Eruption (1976), Tolbachik Volcano, Kamchatka Peninsula, Russia. Scale: See Image.
© Rruff Database

Filatovite Crystallography

Axial Ratios:

a:b:c =0.656:1:1.0987

Cell Dimensions:

a = 8.772, b = 13.37, c = 14.69, Z = 8; beta = 115.994° V = 1,548.58 Den(Calc)= 2.92

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.364(1)(220,204,040), 3.897(0.7)(130), 4.329(0.7)(202), 2.981(0.6)(042), 3.3(0.5)(004), 2.646(0.4)(242), 3.066(0.4)(132),

Crystal Structure:

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Filatov S K , Krivovichev S V , Burns P C , Vergasova L P , European Journal of Mineralogy , 16 (2004) p.537-543, Crystal structure of filatovite, K[(Al,Zn)2(As,Si)2O8],, the first arsenate of the feldspar group

Physical Properties of Filatovite

Cleavage:

{100} Good

Color:

Colorless.

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Filatovite

Gladstone-Dale:

CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1831,KC= 0.1849
Ncalc = 1.54

Optical Data:

Biaxial (-), a=1.532, b=1.535, g=1.537, bire=0.0050

Calculated Properties of Filatovite

Electron Density:

Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Filatovite =2.92 gm/cc.

Fermion Index:

Fermion Index = 0.0041899769
Boson Index = 0.9958100231

Photoelectric:

PE_Filatovite= 21.61 barns/electron
U=PE_Filatovite x r_electron= 60.34 barns/cc.

Radioactivity:

GRapi = 145.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Filatovite per GRapi unit = 0.69 (%)

Estimated Radioactivity from Filatovite - barely detectable

Filatovite Classification

Dana Class:

76.01.01.08 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.01)K (Na,Ba) feldspars

76.01.01.01 Orthoclase KAlSi3O8 C 2/m 2/m

76.01.01.02 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

76.01.01.03 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

76.01.01.04 Celsian BaAl2Si2O8 I21/c 2/m

76.01.01.05 Microcline KAlSi3O8 C1 1

76.01.01.06 Anorthoclase (Na,K)AlSi3O8 C1 1

76.01.01.07 Rubicline! (Rb,K)AlSi3O8 P1 1

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

Strunz Class:

08.AC.85 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.85 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m

Other Filatovite Information

References:

NAME( CanMin, 42:1907) PHYS. PROP.(CanMin, 42:1907) OPTIC PROP.(CanMin, 42:1907)

See Also:

Links to other databases for Filatovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Filatovite

K[(Al,Zn)2(As,Si)2O8]
Dana No: 76.01.01.08 Strunz No: 08.AC.85
Locality:

Notes: