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Filatovite Mineral Data
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General Filatovite Information
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 Chemical Formula: |
K[(Al,Zn)2(As,Si)2O8] |
| Composition: |
Molecular Weight = 340.02 gm |
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Potassium 10.58 % K 12.74 % K2O |
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Sodium 0.47 % Na 0.64 % Na2O |
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Aluminum 14.36 % Al 27.14 % Al2O3 |
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Zinc 3.08 % Zn 3.83 % ZnO |
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Iron 0.16 % Fe 0.21 % FeO |
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Copper 0.75 % Cu 0.94 % CuO |
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Silicon 5.78 % Si 12.37 % SiO2 |
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Arsenic 26.44 % As 40.56 % As2O5 |
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Phosphorus 0.73 % P 1.67 % P2O5 |
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Oxygen 37.64 % O |
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______ ______ |
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100.00 % 100.09 % = TOTAL OXIDE |
| Empirical Formula: |
K0.92Na0.07Al1.81Zn0.16Cu0.04Fe2+0.01As1.2Si0.7P0.08O8 |
| 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 |
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Filatovite Image |
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Images:
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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 |
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Filatovite Crystallography
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| 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 - Prismatic H-M Symbol (2/m) Space Group: I2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 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), |
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Physical Properties of Filatovite
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| 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 |
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Optical Properties of Filatovite
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| 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 |
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Calculated Properties of Filatovite
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| Electron Density: |
Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Filatovite =2.92 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0041899769
Boson Index = 0.9958100231 |
| Photoelectric: |
PEFilatovite = 21.61 barns/electron
U=PEFilatovite x relectron= 60.34 barns/cc.
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| Radioactivity: |
GRapi = 145.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Filatovite per GRapi unit = 0.69 (%)
Estimated Radioactivity from Filatovite  - barely detectable
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Filatovite Classification
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| Dana Class: |
76.01.01.08 (76)Tectosilicate Al-Si Framework |
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(76.01)with Al-Si frameworks |
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(76.01.01)K (Na,Ba) feldspars |
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76.01.01.01 Orthoclase KAlSi3O8 C 2/m 2/m |
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76.01.01.02 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m |
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76.01.01.03 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m |
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76.01.01.04 Celsian BaAl2Si2O8 I21/c 2/m |
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76.01.01.05 Microcline KAlSi3O8 C1 1 |
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76.01.01.06 Anorthoclase (Na,K)AlSi3O8 C1 1 |
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76.01.01.07 Rubicline! (Rb,K)AlSi3O8 P1 1 |
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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 |
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08.A - Phosphates, etc. without additional anions, without H2O |
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08.AC -With medium-sized and large cations |
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08.AC.85 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m |
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Other Filatovite Information
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| 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
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:
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