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Faizievite

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Formula:
K2Na(Ca6Na)Ti4Li6[F2|Si24O66]
System:
Triclinic
Colour:
Colorless
Hardness:
4 - 4½
Name:
name honors Faiziev Abdulkhak Radzhabovitch (born 1938) of Dushanbe, Tadjikistan, professor and member-correspondent of the Academy of Sciences of the Republic of Tadjikistan.
Related to the Beryl Group and Osumilite Group minerals. Unique combination of elements, but also a chemical similarity to baratovite and katayamalite.

Classification of Faizievite

Approved
Approval Year:
2006
9.CM.10

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
63.2.10.1

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
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http://www.mindat.org/min-31306.html
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Type Occurrence of Faizievite

General Appearance of Type Material:
tabular plates without vicinal forms, and up to 0.3 cm in maximum dimension.
Place of Conservation of Type Material:
Fersman Mineralоgical Museum, Russian Academy of Science
Geological Setting of Type Material:
quartz boulder

Physical Properties of Faizievite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colorless
Hardness (Mohs):
4 - 4½
Hardness (Vickers):
VHN50=445 kg/mm2
Tenacity:
Brittle
Density:
2.83(2) g/cm3 (Measured)    2.819 g/cm3 (Calculated)

Crystallography of Faizievite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.8156(9) Å, b = 9.8249(9) Å, c = 17.3087(16) Å
α = 99.209(2)°, β = 94.67(2)°, γ = 119.839(1)°
Ratio:
a:b:c = 0.999 : 1 : 1.762
Unit Cell Volume:
V 1,403.74 ų (Calculated from Unit Cell)
Z:
1

Optical Data of Faizievite

Type:
Biaxial (+)
RI values:
nα = 1.651(2) nβ = 1.655(2) nγ = 1.657(2)
2V:
Measured: 72° (2), Calculated: 70.4°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Faizievite

Formula:
K2Na(Ca6Na)Ti4Li6[F2|Si24O66]
All elements listed in formula:

Relationship of Faizievite to other Species

Structurally related to group(s):
9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2O
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30
9.CM.05DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]
9.CM.05EifeliteKNa3Mg4Si12O30
9.CM.05Merrihueite(K,Na)2(Fe,Mg)5Si12O30
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2O
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30
9.CM.05Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
9.CM.05PoudretteiteKNa2B3Si12O30
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
9.CM.05SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]

Other Names for Faizievite

Name in Other Languages:
Simplified Chinese:氟硅钛钙锂石

Other Information

In shortwave ultraviolet light, it has a bright white luminescence; in longwave ultraviolet light, it does not luminesce.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Faizievite

Reference List:
Agakhanov A A, Pautov L A, Uvarova Y A, Sokolova E V, Hawthorne F C, Karpenko V Y, Gafurov F G (2007) Faizievite, K2Na(Ca6Na)Ti4Li6Si24O66F2 - a new mineral species. New Data on Minerals. Moscow 42, 5-10

Internet Links for Faizievite

Localities for Faizievite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Tajikistan (TL)
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
IMA Website; Agakhanov A.A., Pautov L.A., Karpenko V.Yu., Bekenova G.K., Uvarova Y.A. (2011) Orlovite, KLi2 TiSi4 O11F, a new mineral of the mica group New Mineral Data 46:13-19
Mineral and/or Locality  
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