Filatovite Mineral Data
General Filatovite Information
Chemical Formula:
K[(Al,Zn)2(As,Si)2O8]
Composition:
Molecular Weight = 340.02 gm
Potassium 10.58 % K 12.74 % K2 O
Sodium 0.47 % Na 0.64 % Na2 O
Aluminum 14.36 % Al 27.14 % Al2 O3
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 % As2 O5
Phosphorus 0.73 % P 1.67 % P2 O5
Oxygen 37.64 % O
______ ______
100.00 % 100.09 % = TOTAL OXIDE
Empirical Formula:
K0.92 Na0.07 Al1.81 Zn0.16 Cu0.04 Fe2+ 0.01 As1.2 Si0.7 P0.08 O8
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 - Prismatic H-M Symbol (2/m) Space Group: I2/c
X Ray Diffraction:
By Intensity(I/Io ): 3.364(1)(2 20,2 04,040), 3.897(0.7)(1 30), 4.329(0.7)(2 02),
2.981(0.6)(042), 3.3(0.5)(004), 2.646(0.4)(2 42), 3.066(0.4)(132),
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:
PEFilatovite = 21.61 barns/electronU=PEFilatovite 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 - 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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