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Dualite

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Formula:
Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9
Colour:
yellow
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.84 - 3
Crystal System:
Trigonal
Member of:
Name:
In allusion to the dual taxonomic membership of the mineral, which is both a zirconosilicate and a titanosilicate
Eudialyte group.

Bimodular structure, with alluaivite and eudialyte modules. 24-layered framework, doubled c value in comparison with ordinary eudialyte (Khomyakov et al., 2008). Second bimodular member after labyrinthite.

Third group member with essential Ti, after alluaivite and labyrinthite.

Chemically related to rastsvetaevite and labyrinthite, but combination of elements is unique (chemically similar 'calcian seidozerite' and kochite differ in being F-rich).


Hide all sections | Show all sections

Classification of DualiteHide

Approved
Approval Year:
2005
9.CO.10

9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si9O27]18- 9-membered rings
64.1b.1.4

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
1b :

Physical Properties of DualiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
yellow
Streak:
white
Hardness:
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.84 - 3 g/cm3 (Measured)    2.814 g/cm3 (Calculated)

Optical Data of DualiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.610 nε = 1.613
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of DualiteHide

Formula:
Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9
IMA Formula:
Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3MnSi51O144(OH,H2O,Cl)9
Common Impurities:
Ce,Sr,Mn,Fe,Ti,Cl,Nb,Ba,K;Al

Crystallography of DualiteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 14.153(9) Å, c = 60.72(5) Å
Ratio:
a:c = 1 : 4.29
Unit Cell V:
10533 ų
Z:
3

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.11 (40)
4.31 (50)
2.964 (100)
2.839 (90)
2.159 (60)
1.770 (60)
1.362 (50)
(

Type Occurrence of DualiteHide

General Appearance of Type Material:
anhedral grains up to 0.3-0.5 mm across
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow, russia
Geological Setting of Type Material:
Hyperagpaitic pegmatoid rock.
Associated Minerals at Type Locality:

Synonyms of DualiteHide

Relationship of Dualite to other SpeciesHide

Member of:
Other Members of this group:
AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
AndrianoviteNa12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5Trig. 3m : R3m
Aqualite(H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9ClTrig. 3 : R3
CarbokentbrooksiteNa11-12(Na,Ce)3Ca6Mn3Zr3Nb[(OH)3|CO3|(Si3O9)2|(Si9O27)2SiO] · H2OTrig. 3m : R3m
DavinciiteNa12K3Ca6Fe2+3Zr3(Si26O73OH)Cl2 Trig. 3m : R3m
EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
FeklicheviteNa11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5Trig. 3m : R3m
FengchengiteNa123(Ca,Sr)6Fe3+3 Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
FerrokentbrooksiteNa15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2Trig. 3m : R3m
GeorgbarsanoviteNa12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2·H2OTrig. 3m : R3m
GolysheviteNa10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2OTrig. 3m : R3m
Hydrorastsvetaevite(Na11(H3O)11K6(H2O)1.5Sr)Ca12Fe3Na2MnZr6Si52O144(OH)4.5Cl3.5Trig. 3m : R3m
Ikranite(Na,H3O)15(Ca,Mn2+)6Fe3+2Zr3-4[Cl|(H0-3Si3O9)2|{(Si9O27)2,(Si9O27)2SiO}] · 2-3H2OTrig. 3m : R3m
Ilyukhinite(H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2·3H2OTrig. 3m : R3m
Johnsenite-(Ce)Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2Trig. 3m : R3m
Kentbrooksite(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2OTrig. 3m : R3m
KhomyakoviteNa12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
Labyrinthite(Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3Trig. 3 : R3
ManganoeudialyteNa14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6Trig. 3m : R3m
ManganokhomyakoviteNa12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
MogoviditeNa9(Ca,Na)12Fe2Zr3Si25O72(CO3) (OH)4Trig. 3m : R3m
OneilliteNa15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2Trig. 3 : R3
RaslakiteNa15Ca3Fe2+3(Na,Zr)3Zr3Nb<0.5[(Cl,OH)|(Si3O9)2|(Si9O27)2SiO] · 3(OH,H2O)Trig. 3
RastsvetaeviteNa27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2Trig. 3m : R3m
SiudaiteNa8(Mn2+2Na)Ca6(Fe3+,Mn2+)3Zr3NbSi24(Si,◻,Ti)O74(OH)2Cl·5H2OTrig. 3m : R3m
TaseqiteNa12Sr3Ca6Fe3Zr3Nb[Cl2|(Si3O9)2|(Si9O27)2SiO] · 3(O,OH,H2O)Trig. 3m : R3m
UM1971-22-SiO:CaClFeHMgMnNaNbZrNa12Ca5(Ce,La,Y,Ca)Zr3(Zr,Nb)(Fe,Mn)3[Si9O24-26(OH)1-3]2[Si3O9]2ClTrig. 3m : R3m
UM1990-79-SiO:CaClFeHMnNaNbREEZrNa14Ca5(Mg,Ca,Mn)Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Zr)3(Mn,Na,Ce,La,Y)(Na,H2O,K,Sr)(OH)4-5(OH,Cl)
UM1990-80-SiO:CaFeHMnNaNbREEZrNa14Ca4(Mn,Ca)2Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Mn,Al,Ti)3(Na,Ce,La,Y,Mn)(Na,H2O,K,Sr)(OH)7-8
UM1998-21-SiO:CaCeClHMnNaZrNa16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4Trig. 3m : R3m
UM1999-36-SiO:CaCeHMnNaNbSrZrNa17(Ca,Ce,Sr)2Mn3(Zr,Nb)4Si25O73(O,OH,F,Cl)5Trig. 3 : R3
UM2000-66-SiO:CaClFeHMnNaNbSrZrNa12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11Trig. 3m : R3m
UM2003-39-SiO:CaClFeHHfNaNbSrTaTiZrNa12(Na,K,Mn,Sr)2Ca5(Ca,Mn)(Zr,Hf)3(Fe,◻,Ta)3(Si,Nb,W)(Si,Al,Ti)Si24O72(OH,O)3.5Cl•1.2H2O
UM2004-51-SiO:CaClFFeHNaNbTiNa16Ca6(Fe,Mn)3Zr3(Ti,Nb)Si26O72FCl0.5•nH2OTrig. 3m : R3m
UM2006-17-SiO:CaClFFeHMnNaZrNa15(Ca3Mn3)Zr3(Fe,Zr)3SiSi(Si3O9)2(Si9O27)2O2(OH,F,Cl)3•2H2O
UM2006-18-SiO:CaClFFeHMnNaZrNa15Ca3(Mn,Fe)3Zr3(Zr,Na)3(Si,Nb)(S,Ti,Si)(Si3O9)2(Si9O27)2(O,OH)5(Cl,F,H2O)
UM2006-28-SiO:CaHMnNaZrNa33Ca12Zr6Mn3(Mn,Nb,Ti)2Si50O132(O,OH)12(OH,H2O,Cl)10
UM2010-06-SiO:CaFeHMnNaNbREETiZr[Na,(H3O)]15(Ca3Mn3)Na3Zr3(Si,Ti)[Si25O72OH](OH)2·2H2O
Unnamed (Eudialyte 3248)Na29Ca12Zr6[Si48O132(O,OH)12]{[Na]4[Si]2}{[Mn]3[Mn,Nb,Ti]2}(OH,H2O,Cl)10Trig. 3m (3 2/m) : R3m
Unnamed (Hydrated Hydrous Na-Ca-Mn-Fe-Zr-Ti Silicate Chloride)Na37Ca10Mn2FeZr6Si50(Ti,Nb)2O144(OH)5Cl3·H2OTrig. 3m : R3m
VoronkoviteNa15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2OTrig. 3 : R3
Zirsilite-(Ce)Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2OTrig. 3m : R3m

Related Minerals - Nickel-Strunz GroupingHide

9.CO.10AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
9.CO.10EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
9.CO.10FerrokentbrooksiteNa15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2Trig. 3m : R3m
9.CO.10Kentbrooksite(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2OTrig. 3m : R3m
9.CO.10KhomyakoviteNa12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
9.CO.10ManganokhomyakoviteNa12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
9.CO.10OneilliteNa15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2Trig. 3 : R3
9.CO.10RaslakiteNa15Ca3Fe2+3(Na,Zr)3Zr3Nb<0.5[(Cl,OH)|(Si3O9)2|(Si9O27)2SiO] · 3(OH,H2O)Trig. 3
9.CO.10FeklicheviteNa11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5Trig. 3m : R3m
9.CO.10CarbokentbrooksiteNa11-12(Na,Ce)3Ca6Mn3Zr3Nb[(OH)3|CO3|(Si3O9)2|(Si9O27)2SiO] · H2OTrig. 3m : R3m
9.CO.10Zirsilite-(Ce)Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2OTrig. 3m : R3m
9.CO.10Ikranite(Na,H3O)15(Ca,Mn2+)6Fe3+2Zr3-4[Cl|(H0-3Si3O9)2|{(Si9O27)2,(Si9O27)2SiO}] · 2-3H2OTrig. 3m : R3m
9.CO.10TaseqiteNa12Sr3Ca6Fe3Zr3Nb[Cl2|(Si3O9)2|(Si9O27)2SiO] · 3(O,OH,H2O)Trig. 3m : R3m
9.CO.10RastsvetaeviteNa27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2Trig. 3m : R3m
9.CO.10GolysheviteNa10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2OTrig. 3m : R3m
9.CO.10Labyrinthite(Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3Trig. 3 : R3
9.CO.10Johnsenite-(Ce)Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2Trig. 3m : R3m
9.CO.10MogoviditeNa9(Ca,Na)12Fe2Zr3Si25O72(CO3) (OH)4Trig. 3m : R3m
9.CO.10GeorgbarsanoviteNa12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2·H2OTrig. 3m : R3m
9.CO.10Aqualite(H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9ClTrig. 3 : R3
9.CO.10AndrianoviteNa12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5Trig. 3m : R3m
9.CO.10VoronkoviteNa15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2OTrig. 3 : R3
9.CO.10UM1999-36-SiO:CaCeHMnNaNbSrZrNa17(Ca,Ce,Sr)2Mn3(Zr,Nb)4Si25O73(O,OH,F,Cl)5Trig. 3 : R3
9.CO.10UM2000-66-SiO:CaClFeHMnNaNbSrZrNa12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11Trig. 3m : R3m
9.CO.10ManganoeudialyteNa14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6Trig. 3m : R3m
9.CO.10UM1990-78-SiO:CaClFeHKNaZr(H3O)7(Na,K)5(Ca,Sr,Mn)6Zr3[Si3O7(O,OH)2]2[Si9O23(O,OH)4]2[SiNaFe(Zr,Ti,Al,Nb)□]Cl1.5(O,OH)Trig. 3m : R3m
9.CO.10UM1990-79-SiO:CaClFeHMnNaNbREEZrNa14Ca5(Mg,Ca,Mn)Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Zr)3(Mn,Na,Ce,La,Y)(Na,H2O,K,Sr)(OH)4-5(OH,Cl)
9.CO.10UM1971-22-SiO:CaClFeHMgMnNaNbZrNa12Ca5(Ce,La,Y,Ca)Zr3(Zr,Nb)(Fe,Mn)3[Si9O24-26(OH)1-3]2[Si3O9]2ClTrig. 3m : R3m
9.CO.10UM1998-21-SiO:CaCeClHMnNaZrNa16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4Trig. 3m : R3m

Related Minerals - Dana Grouping (8th Ed.)Hide

64.1b.1.1AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
64.1b.1.2RastsvetaeviteNa27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2Trig. 3m : R3m
64.1b.1.3Labyrinthite(Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3Trig. 3 : R3

Fluorescence of DualiteHide

non-fluorescent

Other InformationHide

Notes:
dissolves and gelatinizes in acid at room temperature
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 DualiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Khomyakov, A.P., Nechelyustov, G.N., Rastsvetaeva, R.K. (2007) Dualite, a new zircono-titanosilicate with a modular eudialyte-like structure from Lovozero alkaline massif, Kola Peninsula, Russia. Proceedings of the Russian Mineralogical Society: 136(4): 31-42.

Internet Links for DualiteHide

Localities for DualiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Murmansk Oblast
    • Lovozero Massif
Khomyakov, A.P., G.N.Nechelyustov, R.K.Rastsvetaeva: "Dualite, a new zircono-titanosilicate with a modular eudialyte-like structure from Lovozero alkaline massif, Kola Peninsula, Russia", Proceedings of the Russian Min. Soc. 136 (4), 31-42(2007)
Mineral and/or Locality  
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