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Tillmannsite Mineral Data
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General Tillmannsite Information
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 Chemical Formula: |
(Ag3Hg)(V,As)O4 |
| Composition: |
Molecular Weight = 645.05 gm |
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Vanadium 5.29 % V 9.45 % V2O5 |
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Silver 49.83 % Ag 53.53 % Ag2O |
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Mercury 30.48 % Hg 31.69 % Hg2O |
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Arsenic 4.18 % As 6.41 % As2O5 |
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Oxygen 10.22 % O |
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______ ______ |
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100.00 % 101.08 % = TOTAL OXIDE |
| Empirical Formula: |
Ag2.98Hg0.98(VO4)0.67(AsO4)0.36 |
| Environment: |
Supergene product in small geodes in mixed carbonate gangue. |
| IMA Status: |
Approved IMA 2003 (Dana # Added) |
| Locality: |
Old copper mines at Roua, Alpes-Maritimes, France. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Ekkhart Tillmanns (1941-) of the Institute of Mineralogy and Crystallography, Wien, Austria. |
| Synonym: |
IMA2001-010 |
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Tillmannsite Crystallography
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| Axial Ratios: |
a:c = 1:0.60152 |
| Cell Dimensions: |
a = 7.727, c = 4.648, Z = 2; V = 277.52 Den(Calc)= 7.72 |
| Crystal System: |
Tetragonal - Disphenoidal H-M Symbol (4) Space Group: I 4 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.735(1), 2.772(1)(100,211), 2.324(0.3)(002),5.45(0.25)(110), 2.254(0.2)(301), 1.683(0.15)(312), 1.74(0.15)(411), |
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Physical Properties of Tillmannsite
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| Cleavage: |
None |
| Color: |
Red, Brownish red. |
| Diaphaneity: |
Translucent |
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Pseudo Octohedral - Crystals show an octohedral outline. |
| Luster: |
Adamantine |
| Streak: |
brownish red |
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Optical Properties of Tillmannsite
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| Gladstone-Dale: |
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1813,KC= 0.1781
Ncalc = 2.37 |
| Optical Data: |
Uniaxial (+), w=2.3, e=2.5, bire=0.2000. |
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Calculated Properties of Tillmannsite
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| Electron Density: |
Bulk Density (Electron Density)=6.67 gm/cc
note: Specific Gravity of Tillmannsite =7.72 gm/cc.
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| Fermion Index: |
Fermion Index = 0.09
Boson Index = 0.91 |
| Photoelectric: |
PETillmannsite = 634.84 barns/electron
U=PETillmannsite x rElectron Density=4,235.20 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tillmannsite is Not Radioactive |
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Tillmannsite Classification
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| Dana Class: |
38.03.11.01 (38)Anhydrous Phosphates, etc |
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(38.03)(A+ B++)3 (XO4)2 |
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(38.03.11)Dana Group |
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38.03.11.01 Tillmannsite! (Ag3Hg)(V,As)O4 I 4 4 |
| Strunz Class: |
08.AC.80 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.A - Phosphates, etc. without additional anions, without H2O |
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08.AC -With medium-sized and large cations |
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08.AC.80 Tillmannsite! (Ag3Hg)(V,As)O4 I 4 4 |
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Other Tillmannsite Information
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| References: |
NAME( AmMin, v 88, p 1839) PHYS. PROP.(AmMin, v 88, p 1839) OPTIC PROP.(AmMin, v 88, p 1839) |
| See Also: |
Links to other databases for Tillmannsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Tillmannsite Specimen Label here :
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Tillmannsite
(Ag3Hg)(V,As)O4
Dana No: 38.03.11.01 Strunz No: 08.AC.80
Locality:
Notes:
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