Keckite Mineral Data (original) (raw)

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

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

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 - PrismaticH-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: