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Eudialyte

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Formula:
Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
System:
Trigonal
Colour:
Variable: Carmine-red, ...
Lustre:
Vitreous, Dull
Hardness:
5 - 6
Member of:
Name:
From the Greek for "readily decomposable," in allusion to its easy solubility in acids.
Principal member of the Eudialyte Group.

Note: most "eudialyte" photos on Mindat probably show unanalysed material and should be labeled "Eudialyte Group" since they might represent not eudialyte sensu stricto, but any of the various other members of the eudialyte group.





Visit gemdat.org for gemological information about Eudialyte.

Classification of Eudialyte

Approved
9.CO.10

9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si9O27]18- 9-membered rings
Dana 7th ed.:
64.1.1.1
64.1.1.1

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
1 : Rings with Other Anions and Insular Silicate Groups with mixed ring types
17.3.6

17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)
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Type Occurrence of Eudialyte

Year of Discovery:
1819

Occurrences of Eudialyte

Geological Setting:
Nepheline syenites, alkalic granites.

Physical Properties of Eudialyte

Vitreous, Dull
Diaphaneity (Transparency):
Translucent
Colour:
Variable: Carmine-red, orange-red, orange, pink, cherry-red, brownish-red, yellowish-brown, brown, yellow, violet, green.
Streak:
White to pale pink
Hardness (Mohs):
5 - 6
Tenacity:
Brittle
Cleavage:
Perfect
Distinct on {0001}, imperfect on {1010} and {1014} {1120}.
Fracture:
Irregular/Uneven
Density:
2.74 - 3.1 g/cm3 (Measured)    

Crystallography of Eudialyte

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 14.31Å, c = 30.15Å
Ratio:
a:c = 1 : 2.107
Unit Cell Volume:
V 5,346.84 ų (Calculated from Unit Cell)
Z:
3
Morphology:
short rhombohedral to long prismatic

Crystallographic forms of Eudialyte

Crystal Atlas:
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Eudialyte no.22 - Goldschmidt (1913-1926)
Eudialyte no.24 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Eudialyte

Type:
Uniaxial (+/-)
RI values:
nω = 1.606 - 1.610 nε = 1.610 - 1.613
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Weak
Comments:
O= colorless, pale yellow, pink
E= pink to colorless

Chemical Properties of Eudialyte

Formula:
Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Essential elements:
All elements listed in formula:
Common Impurities:
K,Mg,Sr,TR,Ti,Nb,Al,F,P,S

Relationship of Eudialyte to other Species

Member of:
Other Members of Group:
AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2O
AndrianoviteNa12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5
Aqualite(H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl
CarbokentbrooksiteNa11-12(Na,Ce)3Ca6Mn3Zr3Nb[(OH)3|CO3|(Si3O9)2|(Si9O27)2SiO] · H2O
DavinciiteNa12K3Ca6Fe32+Zr3(Si26O73OH)Cl2
DualiteNa30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9
FeklicheviteNa11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
FengchengiteNa123(Ca,Sr)6Fe33+ Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2
FerrokentbrooksiteNa15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2
GeorgbarsanoviteNa12(Mn,Sr,REE)3Ca6Fe32+Zr3NbSi25O76Cl2·H2O
GolysheviteNa10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2O
Ikranite(Na,H3O)15(Ca,Mn2+)6Fe23+Zr3-4[Cl|(H0-3Si3O9)2|{(Si9O27)2,(Si9O27)2SiO}] · 2-3H2O
Johnsenite-(Ce)Na12(Ce,La,Sr,Ca)3Ca6Mn3Zr3W[(OH,Cl)2|CO3|(Si3O9)2|(Si9O27)2SiO] · H2O
Kentbrooksite(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
KhomyakoviteNa12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2
Labyrinthite(Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3
ManganoeudialyteNa14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6
ManganokhomyakoviteNa12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2
MogoviditeNa9(Ca,Na)5Ca6Zr3Fe2(Si,Nb)(Si9O27)2(Si3O9)2(CO3)(OH,H2O)3Cl0.3
OneilliteNa15Ca3Mn3Fe32+Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
RaslakiteNa15Ca3Fe32+(Na,Zr)3Zr3Nb<0.5[(Cl,OH)|(Si3O9)2|(Si9O27)2SiO] · 3(OH,H2O)
RastsvetaeviteNa27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2
TaseqiteNa12Sr3Ca6Fe3Zr3Nb[Cl2|(Si3O9)2|(Si9O27)2SiO] · 3(O,OH,H2O)
UM1998-21-SiO:CaCeClHMnNaZrNa16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4
VoronkoviteNa15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2O
Zirsilite-(Ce)Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2O
9.CO.10AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2O
9.CO.10FerrokentbrooksiteNa15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2
9.CO.10Kentbrooksite(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
9.CO.10KhomyakoviteNa12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2
9.CO.10ManganokhomyakoviteNa12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2
9.CO.10OneilliteNa15Ca3Mn3Fe32+Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
9.CO.10RaslakiteNa15Ca3Fe32+(Na,Zr)3Zr3Nb<0.5[(Cl,OH)|(Si3O9)2|(Si9O27)2SiO] · 3(OH,H2O)
9.CO.10FeklicheviteNa11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
9.CO.10CarbokentbrooksiteNa11-12(Na,Ce)3Ca6Mn3Zr3Nb[(OH)3|CO3|(Si3O9)2|(Si9O27)2SiO] · H2O
9.CO.10Zirsilite-(Ce)Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2O
9.CO.10Ikranite(Na,H3O)15(Ca,Mn2+)6Fe23+Zr3-4[Cl|(H0-3Si3O9)2|{(Si9O27)2,(Si9O27)2SiO}] · 2-3H2O
9.CO.10TaseqiteNa12Sr3Ca6Fe3Zr3Nb[Cl2|(Si3O9)2|(Si9O27)2SiO] · 3(O,OH,H2O)
9.CO.10RastsvetaeviteNa27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2
9.CO.10GolysheviteNa10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2O
9.CO.10Labyrinthite(Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3
9.CO.10Johnsenite-(Ce)Na12(Ce,La,Sr,Ca)3Ca6Mn3Zr3W[(OH,Cl)2|CO3|(Si3O9)2|(Si9O27)2SiO] · H2O
9.CO.10MogoviditeNa9(Ca,Na)5Ca6Zr3Fe2(Si,Nb)(Si9O27)2(Si3O9)2(CO3)(OH,H2O)3Cl0.3
9.CO.10GeorgbarsanoviteNa12(Mn,Sr,REE)3Ca6Fe32+Zr3NbSi25O76Cl2·H2O
9.CO.10Aqualite(H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl
9.CO.10DualiteNa30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9
9.CO.10AndrianoviteNa12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5
9.CO.10VoronkoviteNa15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2O
9.CO.10UM1999-36-SiO:CaCeHMnNaNbSrZrNa17(Ca,Ce,Sr)2Mn3(Zr,Nb)4Si25O73(O,OH,F,Cl)5
9.CO.10UM2000-66-SiO:CaClFeHMnNaNbSrZrNa12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11
9.CO.10ManganoeudialyteNa14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6
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)
9.CO.10UM-1990-79-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]2Cl
9.CO.10UM1998-21-SiO:CaCeClHMnNaZrNa16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4
17.3.1RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
17.3.2ZunyiteAl13Si5O20(OH,F)18Cl
17.3.3SodaliteNa8(Al6Si6O24)Cl2
17.3.4MarialiteNa4Al3Si9O24Cl
17.3.5TugtupiteNa4(AlBeSi4O12)Cl
17.3.7AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2O
17.3.8NasonitePb6Ca4(Si2O7)3Cl2
17.3.9AsisitePb7SiO9Cl2
17.3.10JagoitePb18Fe43+[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6
17.3.11Friedelite(Mn,Fe)8Si6O15(OH,Cl)10
17.3.12Pyrosmalite-(Fe)(Fe,Mn)8Si6O15(OH,Cl)10
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)(Mn,Fe)8Si6O15(OH,Cl)10
17.3.16Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2
17.3.17TraskiteBa21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O
17.3.18MuiriteBa10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5
17.3.19VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or near
64.1.1.0Eudialyte Group
64.1.1.2FeklicheviteNa11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
64.1.1.3Kentbrooksite(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
64.1.1.4KhomyakoviteNa12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2
64.1.1.5ManganokhomyakoviteNa12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2

Other Names for Eudialyte

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 Eudialyte

Reference List:
Klaproth, M.H. (1810): Chemische Untersuchung des rothen Granats aus Grönland, Beiträge zur chemischen Kenntniss der Mineralkörper, Fünfter Band, Rottmann Berlin, 131-137
JOHNSEN, O., FERRARIS, G., GAULT, R.A., GRICE, J.D., KAMPF, A.R., and PEKOV, I.V. (2003) The nomenclature of eudialyte minerals. Canadian Mineralogist, 41, 785-794.
JOHNSEN, O., and GAULT, R.A. (1997) Chemical variation in eudialyte. Neues Jahrbuch für Mineralogie, Abhandlungen, 171, 215 237.
JOHNSEN, O., and GRICE, J.D., (1998) Crystal chemical characteristics of the eudialyte group. Program with Abstracts, International Mineralogical Association Meeting, Toronto, A108.
JOHNSEN, O., and GRICE, J.D., (1999) The crystal chemistry of the eudialyte group. Canadian Mineralogist, 37, 865 895.
JOHNSEN, O., GRICE, J.D., and GAULT, R.A. (2001) The eudialyte group: a review. Geology of Greenland Survey Bulletin, 190, 65-72.
JOHNSEN, O., PETERSEN, O.V., and GAULT, R.A. (1997) Optical data on minerals of the eudialyte-mesodialyte-eucolite terminology. Neues Jahrbuch für Mineralogie, Monatshefte, Jg. 1997, 371-383.

Khomyakov, A.P., Nechelyustov, G.N., Rastsvetaeva, R.K. (2007): Aqualite, (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl, a new eudialyte-group mineral from Inagli alkaline massif (Sakha-Yakutia,Russia),and the problem of oxonium in hydrated eudialytes. Proceedings of the Russian Mineralogical Society (Zapiski RMO), 136(2), 39-55.

Internet Links for Eudialyte

Specimens:
The following Eudialyte specimens are currently listed for sale on minfind.com.

Localities for Eudialyte

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.
Mineral and/or Locality  
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