Ekatite Mineral Data

Ekatite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


General Ekatite Information

Help on Chemical Formula: Chemical Formula: (Fe+++,Fe++,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2
Help on Composition: Composition: Molecular Weight = 1,761.38 gm
   Zinc       2.97 %  Zn    3.70 % ZnO
   Iron      35.51 %  Fe   21.21 % FeO / 27.20 % Fe2O3
   Silicon    0.96 %  Si    2.05 % SiO2
   Arsenic   32.33 %  As   42.68 % As2O3
   Hydrogen   0.35 %  H     3.12 % H2O
   Oxygen    27.89 %  O
            ______        ______ 
            100.00 %       99.95 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+6Fe2+5.2Zn0.8(OH)6.1(AsO3)7.6(SiO3)0.6
Help on Environment: Environment: Oxidation product occurring on a matrix of chalcocite and etched quartz.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Tsumeb mine, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Dieter Ekat (1935-1996), Namibian mining engineer.
Help on Synonym: Synonym: IMA1998-024
 

Ekatite Image

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

Ekatite

Comments: Divergent spray of dark brown acicular ekatite crystals.
Location: Tsumeb mine, Namibia.. Scale: 15 mm Tall.
© William Pinch

Ekatite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.39544
Help on Cell Dimensions: Cell Dimensions: a = 12.773, c = 5.051, Z = 1; V = 713.66 Den(Calc)= 4.10
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 63mc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.22(1)(211,220), 2.42(0.7)(401,410), 6.37(0.5)(110),1.788(0.4), 2.531(0.4), 2.766(0.3)(400), 11.11(0.3)(100), 1.507(0.3)(701,431), 1.672(0.3)(521),
Click Here for Large Ekatite 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


Keller P , European Journal of Mineralogy , 13 (2001) p.769-777, Ekatite, (Fe3+,Fe2+,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2, a new mineral, from Tsumeb, Namibia, and its crystal structure, Locality: Tsumeb, Namibia

 

Physical Properties of Ekatite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish black.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brown
 

Optical Properties of Ekatite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2524,KC= 0.2466
Ncalc = 2.01
Help on Optical Data: Optical Data: Uniaxial (+), w=1.99, e=2.08, bire=0.0900.
 

Calculated Properties of Ekatite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.85 gm/cc
note: Specific Gravity of Ekatite =4.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0093271825
Boson Index = 0.9906728175
Help on Photoelectric: Photoelectric: PEEkatite = 34.84 barns/electron
U=PEEkatite x rElectron Density= 134.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ekatite is Not Radioactive
 

Ekatite Classification
Help on Dana Class: Dana Class: 43.04.10.02 (43)Compound Phosphates, etc.
  (43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.10)Kraisslite Group
 
43.04.10.01 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6322 6 2 2
 
43.04.10.02 Ekatite! (Fe,Fe,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2 P 63mc 6mm
Help on Strunz Class: Strunz Class: 04.JB.75 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O
 
04.JB.75 Ekatite! (Fe,Fe,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2 P 63mc 6mm
 

Other Ekatite Information
Help on References: References: NAME( AmMin, Vol 87, p 355) PHYS. PROP.(AmMin, Vol 87, p 355) OPTIC PROP.(AmMin, Vol 87, p 355)
Help on See Also: See Also: Links to other databases for Ekatite :
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 Ekatite using:

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

Visit our Advertisers for Ekatite :

A Bijoux Google Search for Ekatite
Adam's Minerals Google Search for Ekatite
Cape Minerals Google Search for Ekatite
Dakota Matrix Minerals Google Search for Ekatite
Excalibur Mineral Corp. Google Search for Ekatite
Exceptional Minerals Google Search for Ekatite
John Betts Fine Minerals Search for Ekatite
McDougall Minerals Google Search for Ekatite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ekatite
Weinrich Minerals, Inc. Google Search for Ekatite

Ask about Ekatite 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 Ekatite Specimen Label here :

Ekatite

(Fe+++,Fe++,Zn)12(OH)6[AsO3]6[AsO3,HOSiO3]2
Dana No: 43.04.10.02 Strunz No: 04.JB.75
Locality:

 

Notes: