Mineralogy Database

Krettnichite Mineral Data

Search Webmineral :

General Krettnichite Information

Help on Chemical  Formula: Chemical Formula: PbMn+++2(VO4)2(OH)2
Help on Composition: Composition: Molecular Weight = 553.38 gm
   Strontium   1.58 %  Sr    1.87 % SrO
   Manganese  16.88 %  Mn   24.25 % Mn2O3
   Vanadium   17.49 %  V    31.22 % V2O5
   Iron        1.01 %  Fe    1.30 % FeO
   Cobalt      2.13 %  Co    2.71 % CoO
   Arsenic     1.35 %  As    2.08 % As2O5
   Hydrogen    0.40 %  H     3.58 % H2O
   Lead       29.95 %  Pb   32.27 % PbO
   Oxygen     29.20 %  O
             ______        ______ 
             100.00 %       99.28 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb0.8Sr0.1Mn3+1.7Co0.2Fe2+0.1V5+1.9As0.1O7.9(OH)2.2
Help on Environment: Environment: Mullock dumps lining the outcrop of a hydrothermal manganite-quartz vein. A member of the tsumcorite group and the Mn+++ analog of mounanaite.
Help on IMA Status: IMA Status: Approved IMA 2001 (Dana # Added)
Help on Locality: Locality: Krettnich, Saarland, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA1998-044

Krettnichite Image

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


Comments: Dark brown to nearly black crystals of krettnichite.
Location: Johann Shaft; Jakob Tunnel (Dump), Krettnich, Wadern, Saarland, Germany. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

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

  Krettnichite   Brackebuschite

Comments: Scanning electron microscope image of a prismatic krettnichite (kr) aggregate associated with manganite (ma) and barian brackebuschite (br) in a vug. The inset is a close-up illustrating the morphology of brackebuschite. (Eur. J. Mineral, 13:146).
Location: hydrothermal manganite-quartz vein at the historic manganese deposit of Krettnich, Saarland, Germany. Scale: See Image.
© Eur. J. Mineral

Krettnichite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4759:1:1.2224
Help on Cell Dimensions: Cell Dimensions: a = 9.275, b = 6.284, c = 7.682, Z = 2; beta = 117.97° V = 395.44 Den(Calc)= 4.65
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.27(1)(112), 3.388(0.95)(002), 2.491(0.93)(112,220),1.697(0.83), 2.946(0.51)(201), 2.85(0.49)(021), 1.869(0.35), 4.695(0.34), 1.6378(0.31)(004),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 3 3 2) ( 0 0 1) ( 3 3 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Krettnichite

Help on Cleavage: Cleavage: {001} Perfect, {hk0} Distinct
Help on Color: Color: Dark brown, Black.
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: brown

Optical Properties of Krettnichite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.129 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2796,KC= 0.2476
Ncalc = 2.15
Help on Optical Data: Optical Data: Biaxial (?), a=2.21, g=2.39, bire=0.1800
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Bireflectance: RL Bireflectance: Distinct.
Help on RL Color: RL Color: Reddish brown.
Help on RL Pleochroism: RL Pleochroism: Slight.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Krettnichite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   15.80   19.20 
 546 nm   14.80   17.80 
 590 nm   14.40   17.30 
 650 nm   14.10   16.80 
Standardized Intensity (100%) Reflection Spectra of Krettnichite in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm    4.35    6.45 
 546 nm    3.79    5.67 
 590 nm    3.63    5.35 
 650 nm    3.48    5.06 
Calculated Relative Intensity Colors of Krettnichite in Air
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 610%
Calculated Relative Intensity Colors of Krettnichite in Oil
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%

Calculated Properties of Krettnichite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Krettnichite =4.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEKrettnichite = 521.23 barns/electron
U=PEKrettnichite x rElectron Density=2,189.05 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Krettnichite is Not Radioactive

Krettnichite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.10)where (A++ B++)3 (XO4)2 Zq
  (41.10.07)Mounanaite Group Mounanaite PbFe2(VO4)2(OH)2 P1 1 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CG.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CG -With large and medium-sized cations, RO4:H2O = 1:1
08.CG.15 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m
08.CG.15 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m
08.CG.15 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m
08.CG.15 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m
08.CG.15 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono
08.CG.15 Mounanaite PbFe2(VO4)2(OH)2 P1 1
08.CG.15 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m
08.CG.15 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m
08.CG.15 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m
08.CG.15 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m
08.CG.15 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m
08.CG.15 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m
08.CG.15 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m
08.CG.15 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Other Krettnichite Information

Help on References: References: NAME( AmMin, V. 86, p 1535) PHYS. PROP.(AmMin, V. 86, p 1535) OPTIC PROP.(AmMin, V. 86, p 1535)
Help on See Also: See Also: Links to other databases for Krettnichite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

Search for Krettnichite using:

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

Visit our Advertisers for Krettnichite :

Ask about Krettnichite 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 Krettnichite Specimen Label here :


Dana No: Strunz No: 08.CG.15





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.