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Keckite Mineral Data

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General Keckite Information

Help on Chemical  Formula: Chemical Formula: Ca(Mn,Zn)2Fe+++3(PO4)4(OH)3•2(H2O)
Help on Composition: Composition: Molecular Weight = 770.34 gm
   Calcium      4.16 %  Ca    5.82 % CaO
   Magnesium    0.32 %  Mg    0.52 % MgO
   Manganese   12.12 %  Mn   15.65 % MnO
   Zinc         1.70 %  Zn    2.11 % ZnO
   Iron        21.75 %  Fe   31.10 % Fe2O3
   Phosphorus  16.08 %  P    36.85 % P2O5
   Hydrogen     0.88 %  H     7.83 % H2O
   Oxygen      42.99 %  O
              ______        ______ 
              100.00 %       99.90 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.8Mg0.1Mn2+1.7Zn0.2Fe3+3(PO4)4(OH)2.7�2(H2O)
Help on Environment: Environment: Weathering product of phosphate minerals in a complex granite pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Hagendorf quarry, Bavaria, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Erich Keck, Etzenricht, Germany, collector of Hagendorf minerals.
Help on Name Pronunciation: Name Pronunciation: Keckite Say KECKITE
 

Keckite Image

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  Keckite

Comments: Brown crystals of keckite on matrix.
Location: Hagendorf, Bavaria, Germany. Scale: .
© Lou Perloff / Photo Atlas of Minerals

Keckite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.089:1:2.7454
Help on Cell Dimensions: Cell Dimensions: a = 15.02, b = 7.19, c = 19.74, Z = 4; beta = 110.5° V = 1,996.80 Den(Calc)= 2.56
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.86(1), 9.3(0.8), 4.98(0.5),
 

Physical Properties of Keckite

Help on Cleavage: Cleavage: {001} Poor, {100} Indistinct
Help on Color: Color: Brown, Gray brown, Yellow brown.
Help on Density: Density: 2.6
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Fan Shaped - Occurs as radiating crystals shaped like a fan.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: yellow white
 

Optical Properties of Keckite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.117 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.134 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2717,KPDmeas= 0.2675,KC= 0.2395
Ncalc = 1.61 - 1.62
Help on Optical Data: Optical Data: Biaxial (-), b=1.692, g=1.699,
Help on Pleochroism (x): Pleochroism (x): reddish brown.
Help on Pleochroism (y): Pleochroism (y): yellow.
Help on Pleochroism (z): Pleochroism (z): paler yellow.
 

Calculated Properties of Keckite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Keckite =2.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0058861935
Boson Index = 0.9941138065
Help on Photoelectric: Photoelectric: PEKeckite = 11.71 barns/electron
U=PEKeckite x rElectron Density= 29.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Keckite is Not Radioactive
 

Keckite Classification

Help on  Dana Class: Dana Class: 42.11.04.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.04)Dana Group
 
42.11.04.01 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3•2(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 08.DH.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
 
08.DH.15 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3•2(H2O) P 21/a 2/m
 
08.DH.15 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m
 
08.DH.15 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m
 
08.DH.15 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21/a 2/m
 
08.DH.15 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(CaFeFe)! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m
 
08.DH.15 Jahnsite-(NaFeMg)! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
 
08.DH.15 Jahnsite-(CaMgMg)! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
 
08.DH.15 Jahnsite-(NaMnMg)! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m
 

Other Keckite 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 Keckite :
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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Print or Cut-and-Paste your Keckite Specimen Label here :

Keckite

Ca(Mn,Zn)2Fe+++3(PO4)4(OH)3•2(H2O)
Dana No: 42.11.04.01 Strunz No: 08.DH.15
Locality:

 

Notes:

 

 
   
 


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