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Sogdianite

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Big Photo

Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan
© Pavel M. Kartashov

Show Sogdianite Photos (5)



Formula:
K(□,Na)
 
2
Li
 
3
(Zr,Fe,Ti)
 
2
[Si
 
12
O
 
30
]
System:HexagonalColour:Violet
Hardness:7
Member of:Osumilite Group
Name:Named after medieval historical name of country where its type locality is - Sogdiana.


Osumilite Group.

Visit gemdat.org for gemological information about Sogdianite. Currently in public beta-test.

Classification of Sogdianite

IMA status:Approved
Strunz 8th edition ID:8/E.22-120
Nickel-Strunz 10th (pending) edition ID:9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th edition ID:63.2.1a.13

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:16.1.16

16 : Silicates Containing Aluminum and other Metals
1 : Aluminosilicates of Li
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Type Occurrence of Sogdianite

Type Locality:Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan
Year of Discovery:1968

Physical Properties of Sogdianite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Violet
Hardness (Mohs):7

Crystallography of Sogdianite

Crystal System:Hexagonal
Cell Parameters:a = 10.08Å, c = 14.24Å
Ratio:a:c = 1 : 1.413
Unit Cell Volume:V 1,253.03 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Sogdianite

Type:Uniaxial (-)
RI values: nω = 1.608 nε = 1.606
Maximum Birefringence:δ = 0.002

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Sogdianite

Formula:
K(□,Na)
 
2
Li
 
3
(Zr,Fe,Ti)
 
2
[Si
 
12
O
 
30
]
Idealised Formula:
K□
 
2
Li
 
3
Zr
 
2
[Si
 
12
O
 
30
]
Essential elements:K, Li, O, Si, Zr
All elements listed in formula:Fe, K, Li, Na, O, Si, Ti, Zr
Common Impurities:Al,Mn,Mg,Ba

Relationship of Sogdianite to other Species

Member of:Osumilite Group
Other Members of Group:

- +
Almarudite
K(□,Na)
 
2
(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
 · 2H
 
2
O
Berezanskite
K□
 
2
Li
 
3
(Ti,Zr,Sn)
 
2
[Si
 
12
O
 
30
]
Brannockite
(K,Na)□
 
2
Li
 
3
(Sn,Zr,Ti)
 
2
[Si
 
12
O
 
30
]
Darapiosite
KNa
 
2
(Zn,Li)
 
3
(Mn,Zr)
 
2
[Si
 
12
O
 
30
]
Dusmatovite
K(Na,□)
 
2
(Zn,Li)
 
3
(Mn
2+
 
,Y,Zr)
 
2
[Si
 
12
O
 
30
]
Friedrichbeckeite
K(□
 
0.5
Na
 
0.5
)
 
2
Mg
 
2
Be
 
3
Si
 
12
O
 
30
Klöchite
(□Na)KFe
2+
2
Zn
 
3
(Si
 
12
O
 
30
)
Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
 · H
 
2
O
Osumilite
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
Osumilite-(Mg)
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
Shibkovite
K(□,K,Na)
 
2
Zn
 
3
Ca
 
2
[Si
 
12
O
 
30
]
Sugilite
K(Na,□)
 
2
Li
 
3
(Fe,Mn,Al,Zr)
 
2
[Si
 
12
O
 
30
]
Trattnerite
□(Fe
3+
 
,Mg,Fe
2+
 
)
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
3
(Si
 
12
O
 
30
)
Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
Related Minerals - Nickel-Strunz Grouping):

- +
9.CM.05Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
 · 2H
 
2
O
9.CM.05Brannockite
(K,Na)□
 
2
Li
 
3
(Sn,Zr,Ti)
 
2
[Si
 
12
O
 
30
]
9.CM.05Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
9.CM.05Darapiosite
KNa
 
2
(Zn,Li)
 
3
(Mn,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Eifelite
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
9.CM.05Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
9.CM.05Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
 · H
 
2
O
9.CM.05Osumilite-(Mg)
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
9.CM.05Osumilite
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
9.CM.05Poudretteite
KNa
 
2
B
 
3
Si
 
12
O
 
30
9.CM.05Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
9.CM.05Sugilite
K(Na,□)
 
2
Li
 
3
(Fe,Mn,Al,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
9.CM.05Berezanskite
K□
 
2
Li
 
3
(Ti,Zr,Sn)
 
2
[Si
 
12
O
 
30
]
9.CM.05Dusmatovite
K(Na,□)
 
2
(Zn,Li)
 
3
(Mn
2+
 
,Y,Zr)
 
2
[Si
 
12
O
 
30
]
9.CM.05Shibkovite
K(□,K,Na)
 
2
Zn
 
3
Ca
 
2
[Si
 
12
O
 
30
]
9.CM.05Almarudite
K(□,Na)
 
2
(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
9.CM.05Trattnerite
□(Fe
3+
 
,Mg,Fe
2+
 
)
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
3
(Si
 
12
O
 
30
)
9.CM.05Oftedalite
(Sc,Ca,Mn
2+
 
)
 
2
K[(Be,Al)
 
3
Si
 
12
O
 
30
]
9.CM.10Faizievite
K
 
2
Na(Ca
 
6
Na)Ti
 
4
Li
 
6
[F
 
2
|Si
 
24
O
 
66
]
Related Minerals - Hey's Index Grouping:

- +
16.1.1Petalite
LiAl(Si
 
4
O
 
10
)
16.1.2Spodumene
LiAlSi
 
2
O
 
6
16.1.3Eucryptite
LiAlSiO
 
4
16.1.4Virgilite
LiAlSi
 
2
O
 
6
16.1.5Cookeite
LiAl
 
4
(AlSi
 
3
O
 
10
)(OH)
 
8
16.1.6Bikitaite
LiAlSi
 
2
O
 
6
 · H
 
2
O
16.1.7Lunijianlaite
Li
 
0.7
Al
 
6.2
(AlSi
 
7
lO
 
20
)(OH,O)
 
10
16.1.8Swinefordite
Li(Al,Li,Mg)
 
4
((Si,Al)
 
4
O
 
10
)
 
2
(OH,F)
 
4
 · nH
 
2
O
16.1.9Holmquistite
☐{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)(OH)
 
2
16.1.13Clino-holmquistite Group
☐{Li
 
2
}{Z
2+
3
Z
3+
2
}(Si
 
8
O
 
22
)((OH),F,Cl)
 
2
16.1.14Magnesioholmquistite
16.1.15Bityite
LiCaAl
 
2
(AlBeSi
 
2
O
 
10
)(OH)
 
2
16.1.17Sugilite
K(Na,□)
 
2
Li
 
3
(Fe,Mn,Al,Zr)
 
2
[Si
 
12
O
 
30
]

Other Names for Sogdianite

Other Languages:
German:Sogdianit
Russian:Согдианит
Spanish:Sogdianita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Sogdianite

Reference List:

- +
Dusmatov V.D. et al. (1968): Doklady Akademii Nauk SSSR: 182: 1173.

American Mineralogist (1969): 54: 1221-1222.

American Mineralogist (1999): 84: 764-768.

Internet Links for Sogdianite

Search Engines:
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    • External Links:
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  • Look for Sogdianite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Sogdianite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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    • Localities for Sogdianite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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.
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Hotazel
    		Michael O’Donoghue, Gems, Sixth Edition (2006), p. 454
    Tajikistan
     
    • Region of Republican Subordination
      • Tien Shan Mts
        • Alai (Alayskiy) Range
    		CanMin 42:107-119 (2004)
    USA
     
    • Washington
      • Okanogan Co.
        • Golden Horn Batholith
    		Micro Probe Volume VI Number 8; Rocks and Minerals, 66:6, p. 456
    Mineral and/or Locality
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