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Metakottigite Mineral Data

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General Metakottigite Information

Help on Chemical  Formula: Chemical Formula: (Zn,Fe+++,Fe++)3(AsO4)2•8((H2O),OH)
Help on Composition: Composition: Molecular Weight = 603.71 gm
   Zinc      18.41 %  Zn   22.92 % ZnO
   Iron      12.03 %  Fe   15.47 % FeO
   Arsenic   24.82 %  As   38.07 % As2O5
   Hydrogen   2.34 %  H    20.89 % H2O
   Oxygen    42.40 %  O
            ______        ______ 
            100.00 %       97.35 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn1.7Fe2+1.3(AsO4)2•6(H2O)(OH)2
Help on Environment: Environment: Secondary mineral from the oxide zone of an arsenic-rich polymetallic mineral deposit, formed by oxidation and concomitant dehydrogenization of ferroan kottigite.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Ojuela mine, Mapimi, Durango, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its dimorphous relationship to kottigite, and by analogy to metavivianite.
Help on Name Pronunciation: Name Pronunciation: Metakottigite + Pronunciation Say METAKOTTIGITE
Help on Synonym: Synonym: Metakoettigite

Metakottigite Image

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Comments: Bladed crystalline sprays of metakottigite crystals on matrix.
Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Metakottigite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8432:1:0.5
Help on Cell Dimensions: Cell Dimensions: a = 7.96, b = 9.44, c = 4.72, Z = 1; alpha = 95.6°, beta = 97°, gamma = 107.8° V = 333.58 Den(Calc)= 3.01
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.909(1), 8.898(0.4), 3.926(0.3),

Physical Properties of Metakottigite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Gray.
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 1.5-2.5 - Hardness very near Gypsum

Optical Properties of Metakottigite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.139 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2256,KC= 0.198
Ncalc = 1.6
Help on Optical Data: Optical Data: Biaxial (+), a=1.648, b=1.68, g=1.716, bire=0.0680, 2V(Calc)=90, 2V(Meas)=93.
Help on Pleochroism (x): Pleochroism (x): deep blue.
Help on Pleochroism (y): Pleochroism (y): yellow.
Help on Pleochroism (z): Pleochroism (z): light yellow.

Calculated Properties of Metakottigite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Metakottigite =3.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMetakottigite = 29.33 barns/electron
U=PEMetakottigite x rElectron Density= 85.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Metakottigite is Not Radioactive

Metakottigite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.08)Dana Group Symplesite Fe3(AsO4)2•8(H2O) P1 1 Metakottigite (Zn,Fe,Fe)3(AsO4)2•8((H2O),OH) P1 1
Help on  Strunz Class: Strunz Class: 08.CE.85 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CE -With only medium-sized cations, RO4:H2O � 1:2.5
08.CE.85 Metavivianite (Fe3-x,Fex)(PO4)2(OH)x•8-x(H2O),x=0.5 P1 or P1 Tri
08.CE.85 Metakottigite (Zn,Fe,Fe)3(AsO4)2•8((H2O),OH) P1 1

Other Metakottigite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Metakottigite :
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

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Dana No: Strunz No: 08.CE.85





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