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Landscape near Métlaoui, Tunisia

Métlaoui, Gafsa Governorate, Tunisia
Colourless to white
Specific Gravity:
Crystal System:
Named after its discovery locality, Tunisia.
This page provides mineralogical data about Tunisite.

Hide all sections | Show all sections

Classification of TunisiteHide

Approval Year:

B : Carbonates with additional anions, without H2O
B : With alkalies, etc.

5 : Miscellaneous

11 : Carbonates
7 : Carbonates of Al

Physical Properties of TunisiteHide

Colourless to white
4½ on Mohs scale
Basal and prismatic
2.51(2) g/cm3 (Measured)    2.48 g/cm3 (Calculated)

Optical Data of TunisiteHide

Uniaxial (+)
RI values:
nω = 1.573() nε = 1.599(1)
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of TunisiteHide


Crystallography of TunisiteHide

Crystal System:
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
Cell Parameters:
a = 11.22(1) Å, c = 6.582(1) Å
a:c = 1 : 0.587
Unit Cell V:
828.60 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
5.615 (10)
2.592 (9)
3.551 (8)
3.288 (7)
2.s26 (7)

Type Occurrence of TunisiteHide

General Appearance of Type Material:
Fills cavities or a thin coating on calcite or small tabular crystals.
Place of Conservation of Type Material:
National Museum in Prague (specimen No. 53823)
Geological Setting of Type Material:
latest hydrothermal stage of lead zinc deposite
Associated Minerals at Type Locality:

Synonyms of TunisiteHide

Other Language Names for TunisiteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Celestine3 photos of Tunisite associated with Celestine on
Calcite2 photos of Tunisite associated with Calcite on
Baryte1 photo of Tunisite associated with Baryte on

Related Minerals - Nickel-Strunz GroupingHide

5.BB.10DawsoniteNaAlCO3(OH)2Orth. mmm (2/m 2/m 2/m) : Imma
5.BB.20SabinaiteNa4Zr2TiO4(CO3)4Mon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.7.1ScarbroiteAl5(CO3)(OH)13 · 5H2OHex.
11.7.2HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
11.7.3DawsoniteNaAlCO3(OH)2Orth. mmm (2/m 2/m 2/m) : Imma
11.7.4HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
11.7.5Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
11.7.6IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
11.7.7AlumohydrocalciteCaAl2(CO3)2(OH)4 · 4H2OTric. 1 : P1
11.7.8Para-alumohydrocalciteCaAl2(CO3)2(OH)4 · 6H2O
11.7.10WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2OTrig. 3m (3 2/m) : P3c1
11.7.11MontroyaliteSr4Al8(CO3)3(OH,F)26 · 10-11H2O
11.7.12DresseriteBaAl2(CO3)2(OH)4 · H2OOrth. mmm (2/m 2/m 2/m)
11.7.13HydrodresseriteBaAl2(CO3)2(OH)4 · 3H2OTric.
11.7.14StrontiodresseriteSrAl2(CO3)2(OH)4 · H2OOrth.

Other InformationHide

Tunisite is easily sliuble in concentrated inorganic acids, except nitric acid
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 TunisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Johan Z, Povondra P, Slánsky E (1969) Tunisite, a new carbonate from Tunisia, American Mineralogist, 54, 1-13.
Schweizerische mineralogische und petrographische Mitteilungen (1979): 59: 223-238.
American Mineralogist (1980): 65: 1070.
American Mineralogist (1982): 67: 418.
Effenberger, H., Kluger, F., Pertlik, D. D. F., & Zemann, J. (1981). Tunisit: Kristallstruktur und Revision der chemischen Formel. Tschermaks mineralogische und petrographische Mitteilungen, 28(1), 65-77.
Frost, R. L., López, A., Scholz, R., & de Oliveira, F. A. (2015). SEM, EDX and vibrational spectroscopic study of the mineral tunisite NaCa 2 Al 4 (CO 3) 4 Cl (OH) 8. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 136, 911-917.

Internet Links for TunisiteHide

Localities for TunisiteHide

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.
  • Auvergne-Rhône-Alpes
    • Drôme
P Haas collection; Martin, R. (1979). La tunisite des" Terres Noires" de la Drôme (France). Stäubli.; Hofmann, B. A., & Bernasconi, S. M. (1998). Review of occurrences and carbon isotope geochemistry of oxalate minerals: implications for the origin and fate of oxalate in diagenetic and hydrothermal fluids. Chemical Geology, 149(1), 127-146.
Saudi Arabia
  • Mintaqah Al Madinah
Faheha, A. A., Hamidalddin, S. Q., Al-Turkestany, N. A., & Ibraheim, N. M. (2012). Concentrations Of Natural And Man-Made Radioactivity Of Surface Soil In Al-Madinh Al-Monawarah, Western Province of Saudi Arabia. Isotope and Radiation Research, 44(2), 495-504.
Tunisia (TL)
  • Al Kåf Governorate (El Kef; Le Kef)
    • Sakiet Sidi Youssef (Saqiyat Sidi Yusuf)
Amer.Min.(1969) 54, 1-13
  • Donetsk (Donets'k) Oblast'
    • Donets Region (Donetsk)
      • Slaviansky district
Belous, I. R., Kirikilitsa, S. I., Levenshteyn, M. L., Rodina, E. K., & Florinskaya, V. N. (1984). Occurrences of mercury in northwestern Donbass salt domes. International Geology Review, 26(5), 573-582.
  • California
    • San Mateo Co.
      • Redwood City
Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
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