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Sodalite

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Formula:
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)Cl
 
2
Some K substitutes for Na in the grey white Afghan sodalites. Hackmanite was originally defined as containing S. The brilliant yellow Fluorescence arise from a disulfide ion with a negative charge replacing the Cl.
System:IsometricColour:All Colours
Hardness:5½ - 6
Member of:Sodalite Group
Name:The name reflects its sodium content.


Sodalite Group.Ideally Sodalite has Na4Cl in the two cages in the unit cell.

Unlike haüyne and nosean, sodalite is virtually CO2-free (Bellatreccia et al., 2009).

In some sodalites the aluminosilicate cages appear to contain only Na and Cl in EDS spectra.
Unlike haüyne and lazurite, Ca and K are seldom in the cages. The grey sodalites from Afghanistan contain minor K.
The white variety Hackmanite is reported to contain S, but EDS studies show if it is there, it often occurs below detection limits (~1%) (R.W.M. Woodside, unpublished data).

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Classification of Sodalite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/J.11-10
Nickel-Strunz 10th (pending) edition ID:9.FB.10

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
Dana 8th edition ID:76.2.3.1

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
Hey's CIM Ref.:17.3.3

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

Type Locality:Ilímaussaq complex, Narsaq, Kujalleq, Greenland
Year of Discovery:1811
Geological Setting of type material:Nepheline Seyenite

Occurrences of Sodalite

Geological Setting:Sodalites occur:
- in alkaline intrusives (Princess Mine, Bancroft, Ontario, Canada);
- in alkaline pegmatites (Mont St Hilaire, Quebec, Canada);
- in carbonatites (Magnet Cove, Arkansas, USA);
- in marble skarns or metasomatized calcareous rocks (Ladjuar Medan, Sar-e-Sang, Afghanistan);
- in phonolites and volcanic ejecta (Mount Vesuvius, Italy).

Physical Properties of Sodalite

Lustre:Vitreous, Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:All Colours
Comment:Colourless, white, light yellow, green, light to very dark blue, gray, pink to violet
Streak:White
Hardness (Mohs):5½ - 6
Tenacity:Brittle
Cleavage:Poor/Indistinct
Poor on {110}
Fracture:Sub-Conchoidal
Density (measured):2.73 g/cm3
Density (calculated):2.31 g/cm3

Crystallography of Sodalite

Crystal System:Isometric
Class (H-M):4 3m - Hextetrahedral
Space Group:P4 3n
Cell Parameters:a = 8.876(6) Å
Unit Cell Volume:V 699.28 ų (Calculated from Unit Cell)
Z:1
Morphology:Crystals rare, dodecahedron.
Twinning:Common on {111} forming pseudohexagonal prisms. (This may not be twinning, but merely elongated growth in the (111) direction). Twinning can occur in these elongated xls. These have rentrants in the terminations and 6 terminal faces instead of 3 for an elongated dodecahedron.
Comment:Ran*e: 8.870 - 8.882 A.
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 Sodalite

Type:Isotropic
RI values: n = 1.483 - 1.487
Maximum Birefringence:δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:Moderate
Pleochroism:Non-pleochroic

Chemical Properties of Sodalite

Formula:
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)Cl
 
2


Some K substitutes for Na in the grey white Afghan sodalites. Hackmanite was originally defined as containing S. The brilliant yellow Fluorescence arise from a disulfide ion with a negative charge replacing the Cl.
Simplified for copy/paste:Na8(Al6Si6O24)Cl2
Essential elements:Al, Cl, Na, O, Si
All elements listed in formula:Al, Cl, Na, O, Si
Common Impurities:Fe,Mn,K,Ca,H2O,S

Relationship of Sodalite to other Species

Member of:Sodalite Group
Other Members of Group:

- +
Berzeline (of Necker)
Haüyne
(Na,Ca)
 
4-8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,S,Cl)
 
1-2
Lazurite
Na
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,S,S
 
2
, S
 
3
,Cl,OH)
 
2
Nosean
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
) · H
 
2
O
Tsaregorodtsevite
(N(CH
 
3
)
 
4
)(AlSi
 
5
O
 
12
)
Vladimirivanovite
Na
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,S
 
3
,S
 
2
,Cl)
 
2
· H
 
2
O
Common Associates:
SanidineNephelineMicroclineFluoriteCancrinite
CalciteBaryteAnkeriteAndraditeAlbite
Aegirine
Related Minerals - Nickel-Strunz Grouping):

- +
9.FB.05Afghanite
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(Cl
 
2
,SO
 
4
,CO
 
3
)
 
3
· 0.5H
 
2
O
9.FB.05Bystrite
(Na,K)
 
7
Ca(Al
 
6
Si
 
6
O
 
24
)(S
 
3
)
 
1.5
· H
 
2
O
9.FB.05Cancrinite
(Na,Ca,☐)
 
8
(Al
 
6
Si
 
6
O
 
24
)(CO
 
3
,SO
 
4
)
 
2
· 2H
 
2
O
9.FB.05Cancrisilite
Na
 
7
(Al
 
5
Si
 
7
O
 
24
)(CO
 
3
) · 3H
 
2
O
9.FB.05Davyne
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(Cl
 
2
,SO
 
4
)
 
2
9.FB.05Franzinite
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
· 0.5H
 
2
O
9.FB.05Giuseppettite
(Na,K,Ca)
 
7-8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,Cl)
 
1-2
9.FB.05Hydroxycancrinite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(OH)
 
2
· 2H
 
2
O
9.FB.05Liottite
(Na,K)
 
16
Ca
 
8
(Al
 
6
Si
 
6
O
 
24
)
 
3
(SO
 
4
)
 
5
Cl
 
4
9.FB.05Microsommite
Na
 
4
K
 
2
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)Cl
 
2
9.FB.05Pitiglianoite
Na
 
6
K
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
) · 2H
 
2
O
9.FB.05Quadridavyne
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)Cl
 
4
9.FB.05Sacrofanite
(Na,K)
 
98
Ca
 
20
(Al
 
6
Si
 
6
O
 
24
)
 
14
(SO
 
4
)
 
26
Cl
 
2
· 8H
 
2
O
9.FB.05Tounkite
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
Cl · H
 
2
O
9.FB.05Vishnevite
(Na,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,CO
 
3
) · 2H
 
2
O
9.FB.05Marinellite
(Na,K)
 
42
Ca
 
6
(Al
 
6
Si
 
6
O
 
24
)
 
6
(SO
 
4
)
 
8
Cl
 
2
· 3H
 
2
O
9.FB.05Farneseite
(Na,Ca,K)
 
56
(Al
 
6
Si
 
6
O
 
24
)
 
7
(SO
 
4
)
 
12
· 6H
 
2
O
9.FB.05Alloriite
(Na,Ca,K)
 
26
Ca
 
4
(Al
 
6
Si
 
6
O
 
24
)
 
4
(SO
 
4
)
 
6
Cl
 
6
9.FB.05Fantappièite
[Na
 
82.5
Ca
 
33
K
 
16.5
](Si
 
99
Al
 
99
O
 
396
)(SO
 
4
)
 
33
· 4H
 
2
O
9.FB.05Kyanoxalite
Na
 
7
(Al
 
6-x
Si
 
6+x
O
 
24
)(C
 
2
O
 
4
)
 
0.5+x
· 5H
 
2
O (0 < x < 0.5)
9.FB.05Balliranoite
(Na,K)
 
6
Ca
 
2
(Si
 
6
Al
 
6
O
 
24
)Cl
 
2
(CO
 
3
)
9.FB.05Carbobystrite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(CO
 
3
) · 3.5H
 
2
O
9.FB.05Depmeierite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(PO
 
4
,CO
 
3
)
 
1-x
· 3H
 
2
O (x<0.5)
9.FB.05Kircherite
Na
 
5
Ca
 
2
K(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
· 0.33H
 
2
O
9.FB.10Bicchulite
Ca
 
2
(Al
 
2
SiO
 
6
)(OH)
 
2
9.FB.10Danalite
Fe
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
9.FB.10Genthelvite
Zn
 
4
(Be
 
3
Si
 
3
O
 
12
)S
9.FB.10Haüyne
(Na,Ca)
 
4-8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,S,Cl)
 
1-2
9.FB.10Helvine
Mn
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
9.FB.10Kamaishilite
Ca
 
2
(Al
 
2
SiO
 
6
)(OH)
 
2
9.FB.10Lazurite
Na
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,S,S
 
2
, S
 
3
,Cl,OH)
 
2
9.FB.10Nosean
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
) · H
 
2
O
9.FB.10Tsaregorodtsevite
(N(CH
 
3
)
 
4
)(AlSi
 
5
O
 
12
)
9.FB.10Tugtupite
Na
 
4
(AlBeSi
 
4
O
 
12
)Cl
9.FB.15Marialite
Na
 
4
Al
 
3
Si
 
9
O
 
24
Cl
9.FB.15Meionite
Ca
 
4
Al
 
6
Si
 
6
O
 
24
CO
 
3
9.FB.15Silvialite
(Ca,Na)
 
4
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,CO
 
3
)
Related Minerals - Hey's Index Grouping:

- +
17.3.1Rustumite
Ca
 
10
(Si
 
2
O
 
7
)
 
2
(SiO
 
4
)(OH)
 
2
Cl
 
2
17.3.2Zunyite
Al
 
13
Si
 
5
O
 
20
(OH,F)
 
18
Cl
17.3.4Marialite
Na
 
4
Al
 
3
Si
 
9
O
 
24
Cl
17.3.5Tugtupite
Na
 
4
(AlBeSi
 
4
O
 
12
)Cl
17.3.6Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
17.3.7Alluaivite
Na
 
19
(Ca,Mn)
 
6
(Ti,Nb)
 
3
Si
 
26
O
 
74
Cl · 2H
 
2
O
17.3.8Nasonite
Pb
 
6
Ca
 
4
(Si
 
2
O
 
7
)
 
3
Cl
 
2
17.3.9Asisite
Pb
 
7
SiO
 
9
Cl
 
2
17.3.10Jagoite
Pb
 
18
Fe
3+
4
[Si
 
4
(Si,Fe
3+
 
)
 
6
][Pb
 
4
Si
 
16
(Si,Fe)
 
4
]O
 
82
Cl
 
6
17.3.11Friedelite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.12Pyrosmalite-(Fe)
(Fe,Mn)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH,Cl)
 
10
17.3.16Mcgillite
(Mn,Fe)
 
8
Si
 
6
O
 
15
(OH)
 
8
Cl
 
2
17.3.17Traskite
Ba
 
21
Ca(Fe
2+
 
,Mn,Ti)
 
4
(Ti,Fe,Mg)
 
12
(Si
 
12
O
 
36
)(Si
 
2
O
 
7
)
 
6
(O,OH)
 
30
Cl
 
6
·14H
 
2
O
17.3.18Muirite
Ba
 
10
Ca
 
2
Mn
2+
 
Ti[(OH,Cl,F)|HSi
 
2
O
 
7
]
 
5
17.3.19Verplanckite
Ba
 
2
(Mn,Fe,Ti)Si
 
2
O
 
6
(O,OH,Cl,F)
 
2
· 3H
 
2
O or near

Other Names for Sodalite

Synonyms:
AlomiteCanadian Blue StoneCanadian LapisDitroiteGlaucolite
Other Languages:
Czech:Sodalit
Dutch:Sodaliet
French:Sodalite
Galician:Sodalita
German:Sodalith
Alomit
Ditroit
Sodalit
Hebrew:סודליט
Italian:Sodalite
Japanese:方ソーダ石
ソダライト
方曹達石
Polish:Sodalit
Portuguese:Sodalita
Russian:Содалит
Simplified Chinese:方钠石
蓝纹石
Spanish:Sodalita
Alomita
Varieties:
Germanate-sodaliteHackmaniteMolybdosodalite

Other Information

Fluorescence in UV light:Bright red-orange under SW UV and blue, white, pink, red, yellow LW UV.
Cathodoluminescent.
Yellowish phosphorescence, may be photochromic in magentas.
Other Information:May give off odor of H2S on fracture.
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 Sodalite

Reference List:

- +
Thomson, T. (1811): A chemical analysis of Sodalite, a new mineral from Greenland, Journal of natural Philosophy, Chemistry and the Arts, Vol 29, 285-292

Thomson, T. (1811): Einige mineralogische Merkwürdigkeiten, 1) Drei grönländische Mineralien (Sodalith, Allanit, Chryolit), Annalen der Physik und Chemie, Vol. 39, 127

Dunin Barkowski, St. (1819): Sodalith entdeckt am Vesuv (Fosso grande) , Annalen der Physik und Chemie, Vol. 63, 382

Van Peteghem, J.K. and Burley, B.J. (1963) Studies on solid solution between sodalite, nosean, and hauyne. Canadian Mineralogist: 7: 808-813.

Annersten, H. & Hassib, A. (1979): Blue sodalite. Canadian Mineralogist, 17, 39-46.

Acta Crystallographica (1984): B40: 6-13.

Zeitschrift für Kristallographie (1992): 199: 75.

Bellatreccia, F., Della Ventura, G., Piccinini, M. Cavallo, A. and Brilli, M. (2009): H2O and CO2 in minerals of the haüyne-sodalite group: an FTIR spectroscopy study. Mineralogical Magazine 73, 399-413.

Mindat.org articles about Sodalite

Article entries:
The Litchfield, Maine Nepheline Syenite PlutonDouglas Watts

Internet Links for Sodalite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    Localities for Sodalite

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