Tomichite Mineral Data + Say TOMICHITE

General Tomichite Information
Help on Chemical Formula: Chemical Formula: (V,Fe)4Ti3AsO13(OH)
Help on Composition: Composition: Molecular Weight = 647.82 gm
   Titanium  22.17 %  Ti   36.99 % TiO2
   Vanadium  30.67 %  V    45.12 % V2O3
   Iron       0.86 %  Fe    1.23 % Fe2O3
   Arsenic   11.57 %  As   17.74 % As2O5
   Hydrogen   0.16 %  H     1.39 % H2O
   Oxygen    34.58 %  O
            ______        ______ 
            100.00 %      102.47 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: V3+3.9Fe3+0.1Ti3AsO13(OH)
Help on Environment: Environment: In a specimen from a hydrothermal gold deposit.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Kalgoorlie, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Stephan A. Tomich (1914-), consulting geologist who discovered the mineral.
 

Tomichite Image

Click Here for Larger Tomichite Image in a New Browser Window Images:
Click Here for Larger Tomichite Image

Tomichite

Comments: Section of drill core with a very rare crystal of tomichite to 1mm.
Location: Hemlo Gold mine, Ontario, Canada. Scale: Core size 2.5 cm.
© Tom Loomis / Dakota Matrix

Tomichite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5021:1:0.3521
Help on Cell Dimensions: Cell Dimensions: a = 7.119, b = 14.176, c = 4.992, Z = 2; beta = 105.05° V = 486.51 Den(Calc)= 4.42
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.662(1), 2.836(0.9), 1.572(0.5),
Click Here for Large Tomichite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


Grey I E , Madsen I C , Harris D C , American Mineralogist , 72 (1987) p.201-208, Barian tomichite, Ba.5(As2).5Ti2(V,Fe)5O13(OH), its crystal structure and, relationship to derbylite and tomichite

View Additional jPOWD Structure files for Tomichite
[1]
 

Physical Properties of Tomichite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.16
Help on Diaphaniety: Diaphaniety: Opaque
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Resinous
Help on Streak: Streak: black
 

Optical Properties of Tomichite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.36 - from Gladstone-Dale relationship (KC = 0.3086) where Ncalc=Dcalc*KC+1
NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.3086) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Moderate, yellowish gray to dark gray.
Help on RL Color: RL Color: Gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tomichite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   17.90   18.30 
   
 420 nm   17.50   17.90 
 440 nm   17.20   17.60 
 460 nm   17.00   17.50 
 480 nm   17.00   17.50 
 500 nm   16.90   17.50 
 520 nm   17.00   17.60 
 540 nm   17.00   17.70 
 560 nm   17.10   17.80 
 580 nm   17.10   17.90 
 600 nm   17.20   17.90 
 620 nm   17.20   18.00 
 640 nm   17.20   18.00 
 660 nm   17.20   18.00 
 680 nm   17.30   18.00 
 700 nm   17.30   18.00 
Calculated Relative Intensity Colors of Tomichite in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 520%
R1                      
R2                      
 

Calculated Properties of Tomichite

Help on Electron Density: Electron Density:

relectron=4.15 gm/cc
note: rTomichite =4.42 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.02978
Boson Index = 0.97022
Help on Photoelectric: Photoelectric:

PETomichite = 17.94 barns/electron
U=PETomichite x relectron= 74.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tomichite is Not Radioactive
 

Tomichite Classification
Help on Dana Class: Dana Class: 46.2.3.1 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.2)with miscellaneous formulae
  (46.2.3)Derbylite Group
 
46.2.3.1 Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m
 
46.2.3.2 Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m
 
46.2.3.3 Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m
Help on Strunz Class: Strunz Class: IV/C.23-20 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.23 - Hemloite - Derbylite series
 
IV/C.23-10 Hemloite (As,Sb)2(Ti,V,Fe,Al)12O23OH P1 1
 
IV/C.23-15 Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m
 
IV/C.23-20 Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m
 
IV/C.23-30 Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m
 

Other Tomichite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Tomichite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

Search for Tomichite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Tomichite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Tomichite Mineral Data :

Ask about Tomichite 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 Español

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

Tomichite

(V,Fe)4Ti3AsO13(OH)
Dana No: 46.2.3.1 Strunz No: IV/C.23-20
Locality:

 

Notes:

 
 
   
 
Go To Webmineral Home Crystallography X-Ray D-Spacing Table Chemical Composition
Dana Classification Strunz Classification Table of Mineral Properties Alphabetical Listing of Minerals
Search Webmineral Photo Gallery of Mineral Images Help Files Links