Keckite Mineral Data

[Mineral Auctions] [Register] [Current Auctions] [Log In] [www.danweinrich.com]
Dan Weinrich Auctions
Specializing In Live Weekly Auctions Of Top Quality Mineral Specimens
The Place To Find Great Specimens At Great Prices!

General Keckite Information

Chemical Formula:

Ca(Mn,Zn)2Fe+++3(PO4)4(OH)3•2(H2O)

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

Empirical Formula:

Ca_0.8Mg_0.1Mn²⁺_1.7Zn_0.2Fe³⁺₃(PO₄)₄(OH)_2.7·2(H₂O)

Environment:

Weathering product of phosphate minerals in a complex granite pegmatite.

IMA Status:

Approved IMA 1979

Locality:

Hagendorf quarry, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Erich Keck, Etzenricht, Germany, collector of Hagendorf minerals.

Name Pronunciation:

Keckite

Keckite Image

Images:

Keckite

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

Keckite Crystallography

Axial Ratios:

a:b:c =2.089:1:2.7454

Cell Dimensions:

a = 15.02, b = 7.19, c = 19.74, Z = 4; beta = 110.5° V = 1,996.80 Den(Calc)= 2.56

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.86(1), 9.3(0.8), 4.98(0.5),

Physical Properties of Keckite

Cleavage:

{001} Poor, {100} Indistinct

Color:

Brown, Gray brown, Yellow brown.

Density:

2.6

Diaphaneity:

Transparent to Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Earthy (Dull)

Streak:

yellow white

Optical Properties of Keckite

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

Optical Data:

Biaxial (-), b=1.692, g=1.699,

Pleochroism (x):

reddish brown.

Pleochroism (y):

yellow.

Pleochroism (z):

paler yellow.

Calculated Properties of Keckite

Electron Density:

Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Keckite =2.60 gm/cc.

Fermion Index:

Fermion Index = 0.0058861935
Boson Index = 0.9941138065

Photoelectric:

PE_Keckite= 11.71 barns/electron
U=PE_Keckite x rElectron Density= 29.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Keckite is Not Radioactive

Keckite Classification

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

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Keckite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Keckite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Keckite Mineral Data :

Ask about Keckite 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 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: