Mineralogy Database

Tillmannsite Mineral Data

Search Webmineral :

General Tillmannsite Information

Help on Chemical  Formula: Chemical Formula: (Ag3Hg)(V,As)O4
Help on Composition: Composition: Molecular Weight = 645.05 gm
   Vanadium   5.29 %  V     9.45 % V2O5
   Silver    49.83 %  Ag   53.53 % Ag2O
   Mercury   30.48 %  Hg   31.69 % Hg2O
   Arsenic    4.18 %  As    6.41 % As2O5
   Oxygen    10.22 %  O
            ______        ______ 
            100.00 %      101.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ag2.98Hg0.98(VO4)0.67(AsO4)0.36
Help on Environment: Environment: Supergene product in small geodes in mixed carbonate gangue.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Old copper mines at Roua, Alpes-Maritimes, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ekkhart Tillmanns (1941-) of the Institute of Mineralogy and Crystallography, Wien, Austria.
Help on Synonym: Synonym: IMA2001-010

Tillmannsite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.60152
Help on Cell Dimensions: Cell Dimensions: a = 7.727, c = 4.648, Z = 2; V = 277.52 Den(Calc)= 7.72
Help on Crystal System: Crystal System: Tetragonal - Disphenoidal H-M Symbol (4) Space Group: I 4
Help on X Ray Diffraction: 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),

Physical Properties of Tillmannsite

Help on Cleavage: Cleavage: None
Help on Color: Color: Red, Brownish red.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Pseudo Octohedral - Crystals show an octohedral outline.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brownish red

Optical Properties of Tillmannsite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1813,KC= 0.1781
Ncalc = 2.37
Help on Optical Data: Optical Data: Uniaxial (+), w=2.3, e=2.5, bire=0.2000.

Calculated Properties of Tillmannsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.67 gm/cc
note: Specific Gravity of Tillmannsite =7.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PETillmannsite = 634.84 barns/electron
U=PETillmannsite x rElectron Density=4,235.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tillmannsite is Not Radioactive

Tillmannsite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.11)Dana Group Tillmannsite! (Ag3Hg)(V,As)O4 I 4 4
Help on  Strunz Class: Strunz Class: 08.AC.80 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
08.AC.80 Tillmannsite! (Ag3Hg)(V,As)O4 I 4 4

Other Tillmannsite Information

Help on References: References: NAME( AmMin, v 88, p 1839) PHYS. PROP.(AmMin, v 88, p 1839) OPTIC PROP.(AmMin, v 88, p 1839)
Help on See Also: 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

Search for Tillmannsite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tillmannsite :

Ask about Tillmannsite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Tillmannsite Specimen Label here :


Dana No: Strunz No: 08.AC.80





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.