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Tunisite Mineral Data

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General Tunisite Information

Help on Chemical  Formula: Chemical Formula: NaCa2Al4(CO3)4(OH)8Cl
Help on Composition: Composition: Molecular Weight = 622.62 gm
   Sodium     3.69 %  Na    4.98 % Na2O
   Calcium   12.87 %  Ca   18.01 % CaO
   Aluminum  17.33 %  Al   32.75 % Al2O3
   Hydrogen   1.30 %  H    11.57 % H2O
   Carbon     7.72 %  C    28.27 % CO2
   Chlorine   5.69 %  Cl    5.69 % Cl
               -   %   Cl   -1.28 % -O=Cl2   
   Oxygen    51.39 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa2Al4(CO3)4(OH)8Cl
Help on Environment: Environment: Hydrothermal mineral, filling cavities in calcite.
Help on IMA Status: IMA Status: Approved IMA 1969
Help on Locality: Locality: Sakiet Sidi Yousseff Pb-Zn mine, between Le Kef and Souk Ahras, Tunisia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tunisite Say TUNISITE
Help on Synonym: Synonym: ICSD 100720
  PDF 27-1001

Tunisite Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: Transparent pearly platy tunisite microcrystal.
Location: Condorcet, Drome, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tunisite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.58663
Help on Cell Dimensions: Cell Dimensions: a = 11.22, c = 6.582, Z = 2; V = 828.60 Den(Calc)= 2.50
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.615(1), 2.592(0.9), 3.551(0.8),

Physical Properties of Tunisite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.51
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 3.5-4.5 - Between Copper Penny and Fluorite-Apatite
Help on Streak: Streak: white

Optical Properties of Tunisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2344,KPDmeas= 0.2335,KC= 0.2321
Ncalc = 1.58
Help on Optical Data: Optical Data: Uniaxial (+), w=1.573, e=1.599, bire=0.0260.

Calculated Properties of Tunisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Tunisite =2.51 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.001271238
Boson Index = 0.998728762
Help on Photoelectric: Photoelectric: PETunisite = 2.63 barns/electron
U=PETunisite x rElectron Density= 6.62 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tunisite is Not Radioactive

Tunisite Classification

Help on  Dana Class: Dana Class: 16a.05.02.01 (16a)Carbonates - Hydroxyl or Halogen
  (16a.05)with miscellaneous formulae
  (16a.05.02)Dana Group
16a.05.02.01 Tunisite NaCa2Al4(CO3)4(OH)8Cl P 4/nmm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 05.BB.15 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BB -With alkalies, etc.
05.BB.15 Tunisite NaCa2Al4(CO3)4(OH)8Cl P 4/nmm 4/m 2/m 2/m

Other Tunisite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tunisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 16a.05.02.01 Strunz No: 05.BB.15





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