Faizievite
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Formula:
K2Na(Ca6Na)Ti4Li6[F2|Si24O66]
System:
Triclinic
Colour:
Colorless
Lustre:
Vitreous
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)
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)
63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
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)
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]
IMA Formula:
Li6K2Na(Ca6Na)Ti4(Si6O18)2(Si12O30)F2
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)°
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
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
Associated Minerals at Type Locality:
Relationship of Faizievite to other Species
Structurally related to group(s):
| Osumilite Group | A complex group of ring silicates; also known as "milarite group" (synonymous). |
| 9.CM.05 | Armenite | BaCa2Al6Si9O30 · 2H2O |
| 9.CM.05 | Brannockite | (K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30] |
| 9.CM.05 | Chayesite | K(Mg,Fe)4FeSi12O30 |
| 9.CM.05 | Darapiosite | K(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30] |
| 9.CM.05 | Eifelite | KNa3Mg4Si12O30 |
| 9.CM.05 | Merrihueite | (K,Na)2(Fe,Mg)5Si12O30 |
| 9.CM.05 | Milarite | K2Ca4Al2Be4Si24O60 · H2O |
| 9.CM.05 | Osumilite-(Mg) | KMg2Al3(Al2Si10)O30 |
| 9.CM.05 | Osumilite | (K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30 |
| 9.CM.05 | Poudretteite | KNa2B3Si12O30 |
| 9.CM.05 | Roedderite | (Na,K)2(Mg,Fe)5Si12O30 |
| 9.CM.05 | Sogdianite | K(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30] |
| 9.CM.05 | Sugilite | K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30] |
| 9.CM.05 | Yagiite | (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 |
| 9.CM.05 | Berezanskite | K□2Li3(Ti,Zr,Sn)2[Si12O30] |
| 9.CM.05 | Dusmatovite | K(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30] |
| 9.CM.05 | Shibkovite | K(□,K,Na)2Zn3Ca2[Si12O30] |
| 9.CM.05 | Almarudite | K(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30] |
| 9.CM.05 | Trattnerite | □(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30) |
| 9.CM.05 | Oftedalite | K(Sc,Ca,Mn2+)2◻2[(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
mindat.org URL:
https://www.mindat.org/min-31306.html
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Localities for Faizievite
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
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(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) | |
| 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 |
Darai-Pioz Glacier, Alai Range, Tien Shan Mtn, Region of Republican Subordination, Tajikistan