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General Tunisite Information |
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 Chemical Formula: |
NaCa2Al4(CO3)4(OH)8Cl | ||
| 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 | |||
| Empirical Formula: |
NaCa2Al4(CO3)4(OH)8Cl | ||
| Environment: |
Hydrothermal mineral, filling cavities in calcite. | ||
| IMA Status: |
Approved IMA 1969 | ||
| Locality: |
Sakiet Sidi Yousseff Pb-Zn mine, between Le Kef and Souk Ahras, Tunisia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
| Name Pronunciation: |
Tunisite  |
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| Synonym: |
ICSD 100720 | ||
| PDF 27-1001 | |||
Tunisite Image | |||
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Images:
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Tunisite Crystallography |
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| Axial Ratios: |
a:c = 1:0.58663 | ||
| Cell Dimensions: |
a = 11.22, c = 6.582, Z = 2; V = 828.60 Den(Calc)= 2.50 | ||
| Crystal System: |
Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm | ||
| X Ray Diffraction: |
By Intensity(I/Io): 5.615(1), 2.592(0.9), 3.551(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Tunisite |
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| Cleavage: |
{???} Perfect | ||
| Color: |
Colorless, White. | ||
| Density: |
2.51 | ||
| Diaphaneity: |
Transparent to Translucent | ||
| Hardness: |
3.5-4.5 - Between Copper Penny and Fluorite-Apatite | ||
| Streak: |
white | ||
Optical Properties of Tunisite |
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| 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 |
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| Optical Data: |
Uniaxial (+), w=1.573, e=1.599, bire=0.0260. | ||
Calculated Properties of Tunisite |
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| Electron Density: |
Bulk Density (Electron Density)=2.52 gm/cc note: Specific Gravity of Tunisite =2.51 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.001271238 Boson Index = 0.998728762 |
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| Photoelectric: |
PETunisite = 2.63 barns/electron U=PETunisite x rElectron Density= 6.62 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tunisite is Not Radioactive |
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Tunisite Classification |
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| Dana Class: |
16a.05.02.01 (16a)Carbonates - Hydroxyl or Halogen | ||
| (16a.05)with miscellaneous formulae | |||
| (16a.05.02)Dana Group | |||
| Strunz Class: |
05.BB.15 05 - CARBONATES (NITRATES) | ||
| 05.B - Carbonates with additional anions, without H2O | |||
| 05.BB -With alkalies, etc. | |||
Other Tunisite Information |
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| 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 15 - WWW-MINCRYST Search for Tunisite using: Visit our Advertisers for Tunisite : A Bijoux Google Search for TunisiteAdam's Minerals Google Search for Tunisite Cape Minerals Google Search for Tunisite Dakota Matrix Minerals Google Search for Tunisite Excalibur Mineral Corp. Google Search for Tunisite Exceptional Minerals Google Search for Tunisite John Betts Fine Minerals Search for Tunisite McDougall Minerals Google Search for Tunisite Mineral News Website Link Rock and Mineral Shows Google Search for Tunisite Weinrich Minerals, Inc. Google Search for Tunisite Ask about Tunisite here : Print or Cut-and-Paste your Tunisite Specimen Label here :
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