Faizievite Mineral Data

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General Faizievite Information

Chemical Formula:

K2Na(Ca6Na)Ti4Li6Si24O66F2

Composition:

Molecular Weight = 2,384.24 gm

Potassium 3.23 % K 3.89 % K₂O

Rubidium 0.11 % Rb 0.12 % Rb₂O

Barium 0.23 % Ba 0.26 % BaO

Sodium 1.48 % Na 1.99 % Na₂O

Strontium 0.62 % Sr 0.74 % SrO

Lithium 1.75 % Li 3.76 % Li₂O

Calcium 10.35 % Ca 14.49 % CaO

Titanium 8.03 % Ti 13.40 % TiO₂

Niobium 0.08 % Nb 0.11 % Nb₂O₅

Silicon 28.28 % Si 60.51 % SiO₂

Oxygen 44.54 % O

Fluorine 1.30 % F 1.30 % F

- % F -0.55 % -O=F₂

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

K_1.97Ba_0.04Rb_0.03Li₆Na_0.86Ca_6.16Na_0.67Sr_0.17Ti₄Nb_0.02Si_24.01O₆₆F_1.63O_0.37

Environment:

Found in a quartz-pectolite boulder in moraine. Related to beryl-group and milarite-group minerals. Faizievite structure can be considered as alternating baratovite and berezanskite blocks alternating along [001].

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Dar-i-Pioz glacier, Alai mountain range, northern Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for Faiziev Abdulkhak Radzhabovitrh (b 1938), professor of the Academy of Sciences of the Republic of Tadjikistan, Dushanbe, Tadjikistan.

Synonym:

IMA2006-037

Faizievite Image

Images:

Faizievite

Comments: Pale brownish yellow massive faizievite associated with quartz.
Location: Dara-i-Pioz Glacier, Alayskiy (Alai) Range, Tien Shan Mts, Districts of the Republican Subordination, Tajikistan. Scale: See Image.
© Rruff Database

Faizievite Crystallography

Axial Ratios:

a:b:c =0.999:1:1.7617

Cell Dimensions:

a = 9.8156, b = 9.8249, c = 17.3087, Z = 1; alpha = 99.209°, beta = 94.67°, gamma = 119.839° V = 1,424.51 Den(Calc)= 2.78

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.35(1), 3.06(0.9), 4.25(0.6),2.885(0.55), 1.848(0.4), 3.14(0.2), 1.868(0.17), 2.87(0.1),

Crystal Structure:

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Uvarova Yu A , Sokolova E , Hawthorne F C , Agakhanov A A , Pautov L A , The Canadian Mineralogist , 46 (2008) p.163-171, The crystal chemistry of faizievite, K2Li6Na(Ca6Na)Ti4[Si6O18]2[Si12O30]F2,, a novel structure based on intercalated blocks of the baratovite and, berezanskite structures, Locality: Dara-i-Poiz glacier, Alai mountain ridge, Tien-Shan Mountains, Tajikistan

Physical Properties of Faizievite

Diaphaneity:

Transparent

Optical Properties of Faizievite

Optical Data:

NCalc= 1.66 - from Gladstone-Dale relationship (KC = 0.2344) where Ncalc=Dcalc*KC+1

Calculated Properties of Faizievite

Electron Density:

Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Faizievite =2.82 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Faizievite= 5.86 barns/electron
U=PE_Faizievite x r_electron= 16.31 barns/cc.

Radioactivity:

GRapi = 90.98 (Gamma Ray American Petroleum Institute Units)
Concentration of Faizievite per GRapi unit = 1.10 (%)

Estimated Radioactivity from Faizievite - barely detectable

Faizievite Classification

Dana Class:

61.01.04.03 (61)Cyclosilicate Six-Membered Rings

(61.01)with [Si6O18] rings; possible (OH) and Al substitution

(61.01.04)Baratovite group

61.01.04.01 Baratovite KCa7(Ti,Zr)2Li3Si12O36F2 C 2/c 2/m

61.01.04.02 Katayamalite (K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2 C1 1

61.01.04.03 Faizievite! K2Na(Ca6Na)Ti4Li6Si24O66F2 P1 1

61.01.04.04 IMA2009-004 KCa7Sn2Li3Si12O36F2 C 2/m 2/m

Strunz Class:

09.CM.10 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CM -[Si6O18]12- 6-membered double rings (sechser-Doppelringe)

09.CM.10 Faizievite! K2Na(Ca6Na)Ti4Li6Si24O66F2 P1 1

Other Faizievite Information

References:

NAME( AmMin, v93:1942) PHYS. PROP.(AmMin, v93:1942) OPTIC PROP.(AmMin, v93:1942)

See Also:

Links to other databases for Faizievite :
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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Faizievite

K2Na(Ca6Na)Ti4Li6Si24O66F2
Dana No: 61.01.04.03 Strunz No: 09.CM.10
Locality:

Notes: