Krettnichite Mineral Data

General Krettnichite Information

Chemical Formula:

PbMn+++2(VO4)2(OH)2

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

Empirical Formula:

Pb_0.8Sr_0.1Mn³⁺_1.7Co_0.2Fe²⁺_0.1V⁵⁺_1.9As_0.1O_7.9(OH)_2.2

Environment:

Mullock dumps lining the outcrop of a hydrothermal manganite-quartz vein. A member of the tsumcorite group and the Mn+++ analog of mounanaite.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Krettnich, Saarland, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA1998-044

Krettnichite Image

Images:

Krettnichite

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

Images:

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

Axial Ratios:

a:b:c =1.4759:1:1.2224

Cell Dimensions:

a = 9.275, b = 6.284, c = 7.682, Z = 2; beta = 117.97° V = 395.44 Den(Calc)= 4.65

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 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),

Forms:

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

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Crystal Structure:

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Brugger J , Armbruster T , Criddle A J , Berlepsch P , Graeser S , Reeves S , European Journal of Mineralogy , 13 (2001) p.145-158, Description, crystal structure, and paragenesis of krettnichite,, PbMn2(VO4)2(OH)2, the Mn3+ analogue of mounanaite

Physical Properties of Krettnichite

Cleavage:

{001} Perfect, {hk0} Distinct

Color:

Dark brown, Black.

Diaphaneity:

Translucent to opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Adamantine

Streak:

brown

Optical Properties of Krettnichite

Gladstone-Dale:

CI calc= -0.129 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2796,KC= 0.2476
Ncalc = 2.15

Optical Data:

Biaxial (?), a=2.21, g=2.39, bire=0.1800

RL Anisotrophism:

Strong.

RL Bireflectance:

Distinct.

RL Color:

Reddish brown.

RL Pleochroism:

Slight.

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**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	610%
R₁
R₂

**Calculated Relative Intensity Colors of Krettnichite in Oil**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	1000%
R₁
R₂

Calculated Properties of Krettnichite

Electron Density:

Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Krettnichite =4.65 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Krettnichite= 521.23 barns/electron
U=PE_Krettnichite x rElectron Density=2,189.05 barns/cc.

Radioactivity:

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

Krettnichite Classification

Dana Class:

41.10.07.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.07)Mounanaite Group

41.10.07.01 Mounanaite PbFe2(VO4)2(OH)2 P1 1

41.10.07.02 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

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

References:

NAME( AmMin, V. 86, p 1535) PHYS. PROP.(AmMin, V. 86, p 1535) OPTIC PROP.(AmMin, V. 86, p 1535)

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
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Krettnichite Specimen Label here :

Krettnichite

PbMn+++2(VO4)2(OH)2
Dana No: 41.10.07.02 Strunz No: 08.CG.15
Locality:

Notes: