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Tunisite

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Landscape near Métlaoui, Tunisia

Métlaoui, Gafsa Governorate, Tunisia
Formula:
NaCa2Al4(CO3)4(OH)8Cl
Colour:
Colourless to white
Hardness:
Specific Gravity:
2.51
Crystal System:
Tetragonal
Name:
Named after its discovery locality, Tunisia.
This page provides mineralogical data about Tunisite.


Hide all sections | Show all sections

Classification of TunisiteHide

Approved
Approval Year:
1967
5.BB.15

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
B : With alkalies, etc.
16a.5.2.1

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : Miscellaneous
11.7.9

11 : Carbonates
7 : Carbonates of Al

Physical Properties of TunisiteHide

Colour:
Colourless to white
Hardness:
4½ on Mohs scale
Cleavage:
Perfect
Basal and prismatic
Density:
2.51(2) g/cm3 (Measured)    2.48 g/cm3 (Calculated)

Optical Data of TunisiteHide

Type:
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:
Moderate

Chemical Properties of TunisiteHide

Formula:
NaCa2Al4(CO3)4(OH)8Cl

Crystallography of TunisiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/nmm
Setting:
P4/nmm
Cell Parameters:
a = 11.22(1) Å, c = 6.582(1) Å
Ratio:
a:c = 1 : 0.587
Unit Cell V:
828.60 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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

German:Tunisit
Spanish:Tunisita

Common AssociatesHide

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

Related Minerals - Nickel-Strunz GroupingHide

5.BB.05BarentsiteNa7Al(HCO3)2(CO3)2F4Tric.
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.
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

Notes:
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.
France
 
  • 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
Ukraine
 
  • 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.
USA
 
  • California
    • San Mateo Co.
      • Emerald Lake Hills
Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Mineral and/or Locality  
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