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Sodalite

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Formula:
Na8(Al6Si6O24)Cl2
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:
Isometric
Colour:
All Colours
Hardness:
5½ - 6
Member of:
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to contain S, but EDS studies show if it is there, it often occurs below detection limits (~1%) (R.W.M. Woodside, unpublished data).

Visit gemdat.org for gemological information about Sodalite.

Classification of Sodalite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.FB.10

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
76.2.3.1

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
17.3.3

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

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

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:
2.73 g/cm3 (Measured)    2.31 g/cm3 (Calculated)

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:
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
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of Sodalite

Formula:
Na8(Al6Si6O24)Cl2

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.
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Mn,K,Ca,H2O,S

Relationship of Sodalite to other Species

Member of:
Other Members of Group:
Berzeline (of Necker)
Haüyne(Na,Ca)4-8(Al6Si6O24)(SO4,S,Cl)1-2
LazuriteNa6 Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2
NoseanNa8(Al6Si6O24)(SO4) · H2O
Tsaregorodtsevite(N(CH3)4)(AlSi5O12)
VladimirivanoviteNa6Ca2(Al6Si6O24)(SO4,S3,S2,Cl)2 · H2O
9.FB.05Afghanite(Na,Ca,K)8(Al6Si6O24)(Cl2,SO4,CO3)3 · 0.5H2O
9.FB.05Bystrite(Na,K)7Ca(Al6Si6O24)(S3)1.5 · H2O
9.FB.05Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
9.FB.05CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2O
9.FB.05Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2
9.FB.05Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2O
9.FB.05Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2
9.FB.05HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2O
9.FB.05Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4
9.FB.05MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2
9.FB.05PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
9.FB.05Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4
9.FB.05Sacrofanite(Na,K)98Ca20(Al6Si6O24)14(SO4)26Cl2 · 8H2O
9.FB.05Tounkite(Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2O
9.FB.05Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2O
9.FB.05Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2O
9.FB.05Farneseite(Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2O
9.FB.05Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6
9.FB.05Fantappièite[Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2O
9.FB.05KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)
9.FB.05Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)
9.FB.05CarbobystriteNa8(Al6Si6O24)(CO3) · 3.5H2O
9.FB.05DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (x<0.5)
9.FB.05KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2O
9.FB.10BicchuliteCa2(Al2SiO6)(OH)2
9.FB.10DanaliteFe42+(Be3Si3O12)S
9.FB.10GenthelviteZn4(Be3Si3O12)S
9.FB.10Haüyne(Na,Ca)4-8(Al6Si6O24)(SO4,S,Cl)1-2
9.FB.10HelvineMn42+(Be3Si3O12)S
9.FB.10KamaishiliteCa2(Al2SiO6)(OH)2
9.FB.10LazuriteNa6 Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2
9.FB.10NoseanNa8(Al6Si6O24)(SO4) · H2O
9.FB.10Tsaregorodtsevite(N(CH3)4)(AlSi5O12)
9.FB.10TugtupiteNa4(AlBeSi4O12)Cl
9.FB.15MarialiteNa4Al3Si9O24Cl
9.FB.15MeioniteCa4Al6Si6O24CO3
9.FB.15Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)
17.3.1RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
17.3.2ZunyiteAl13Si5O20(OH,F)18Cl
17.3.4MarialiteNa4Al3Si9O24Cl
17.3.5TugtupiteNa4(AlBeSi4O12)Cl
17.3.6EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
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

Other Names for Sodalite

Name in Other Languages:

Other Information

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 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 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.

Internet Links for Sodalite

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

Localities for Sodalite

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.
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