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Sogdianite

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Formula:
K(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
System:
Hexagonal
Colour:
Violet, pale pink
Hardness:
7
Member of:
Name:
Named after medieval historical name of country where its type locality is - Sogdiana.

Classification of Sogdianite

Approved
8/E.22-120
9.CM.05

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

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
16.1.16

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

Year of Discovery:
1968

Physical Properties of Sogdianite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Violet, pale pink
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:
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
Max Birefringence:
δ = 0.002
Image 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)2Li3(Zr,Fe,Ti)2[Si12O30]
Idealised Formula:
K□2Li3Zr2[Si12O30]
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Mn,Mg,Ba

Relationship of Sogdianite to other Species

Member of:
Other Members of Group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
ArmeniteBaCa2Al6Si9O30 · 2H2O
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
DarapiositeKNa2(Zn,Li)3(Mn,Zr)2[Si12O30]
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
EifeliteKNa3Mg4Si12O30
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30
Klöchite(□Na)KFe22+Zn3(Si12O30)
Merrihueite(K,Na)2(Fe,Mg)5Si12O30
MilariteK2Ca4Al2Be4Si24O60 · H2O
Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Osumilite-(Mg)KMg2Al3(Al2Si10)O30
PoudretteiteKNa2B3Si12O30
Roedderite(Na,K)2(Mg,Fe)5Si12O30
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2O
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30
9.CM.05DarapiositeKNa2(Zn,Li)3(Mn,Zr)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.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.05Oftedalite(Sc,Ca,Mn2+)2K[(Be,Al)3Si12O30]
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]
16.1.1PetaliteLiAl(Si4O10)
16.1.2SpodumeneLiAlSi2O6
16.1.3EucryptiteLiAlSiO4
16.1.4VirgiliteLiAlSi2O6
16.1.5Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
16.1.6BikitaiteLiAlSi2O6 · H2O
16.1.7LunijianlaiteLi0.7Al6.2(AlSi7O20)(OH,O)10
16.1.8SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2O
16.1.9Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2
16.1.13Clino-holmquistite Root Name☐{Li2}{Z32+Z23+}(Si8O22)(OH,F,Cl)2
16.1.14Magnesioholmquistite
16.1.15BityiteLiCaAl2(AlBeSi2O10)(OH)2
16.1.17SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]

Other Names for Sogdianite

Name in Other Languages:
German:Sogdianit
Simplified Chinese:锆锂大隅石
Spanish:Sogdianita
Traditional Chinese:鋯鋰大隅石

Other Information

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 Sogdianite

Reference List:
Dusmatov V D, Efimov A F, Kataeva Z T, Khoroshilova L A, Yanulov K P (1968): Sogdianite - a new mineral. Doklady Akademii Nauk SSSR 182, 1176-1177. [English abstract: American Mineralogist (1969): 54: 1221-1222]

Cooper M A, Hawthorne F C, Grew E S (1999) The crystal chemistry of sogdianite, a milarite-group mineral. American Mineralogist 84, 764-768.

Internet Links for Sogdianite

Localities for Sogdianite

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.
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Michael O’Donoghue, Gems, Sixth Edition (2006), p. 454
Tajikistan
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
CanMin 42:107-119 (2004); 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
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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