Krautite Mineral Data

Krautite Mineral Data +

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General Krautite Information

Chemical Formula:

MnAs+++++O3(OH)2·(H2O)

Composition:

Molecular Weight = 229.89 gm

Manganese 23.90 % Mn 30.86 % MnO

Arsenic 32.59 % As 49.99 % As₂O₅

Hydrogen 1.75 % H 15.67 % H₂O

Oxygen 41.76 % O

______ ______

100.00 % 96.52 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺AsO₃(OH)₂·(H₂O)

IMA Status:

Approved IMA 1975

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 79619

PDF 29-888

Krautite Image

Images:

Krautite

Comments: Pale pink aggregates of krautite on greenish colored matrix.
Location: Jachymov, Bohemia, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Krautite Crystallography

Axial Ratios:

a:b:c =0.5021:1:0.4261

Cell Dimensions:

a = 8.012, b = 15.956, c = 6.8, Z = 8; beta = 96.6° V = 863.55 Den(Calc)= 3.54

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 3.273(1), 3.862(1), 7.96(1),

Crystal Structure:

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Catti M , Franchini-Angela M , American Mineralogist , 64 (1979) p.1248-1254, Krautite, Mn(H2O)(AsO3OH): crystal structure, hydrogen bonding and relations, with haidingerite and pharmacolite

Physical Properties of Krautite

Cleavage:

[010] Perfect, [101] Good, [101] Distinct

Color:

Light pink.

Density:

3.3

Hardness:

4 - Fluorite

Streak:

white

Optical Properties of Krautite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.061 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1831,KPDmeas= 0.1965,KC= 0.1951

Optical Data:

Biaxial (+), a=1.62, b=1.639, g=1.686, bire=0.0660, 2V(Calc)=68, 2V(Meas)=65.

Calculated Properties of Krautite

Electron Density:

r_electron=3.16 gm/cc
note: r_Krautite=3.30 gm/cc.

Fermion Index

Fermion Index = 0.0002
Boson Index = 0.9998

Photoelectric:

PE_Krautite= 28.28 barns/electron
U=PE_Krautite x r_electron= 89.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Krautite is Not Radioactive

Krautite Classification

Dana Class:

39.1.3.1 (39)Hydrated Acid Phosphates, etc

(39.1)A+ [HXO4] · x(H2O)

(39.1.3)Dana Group

39.1.3.1 Krautite MnAsO3(OH)2·(H2O) P 2₁ 2

Strunz Class:

VII/C.05-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.05 - Kaatialaite - Sterlinghillite series

VII/C.05-10 Kaatialaite Fe[H2AsO4]3·5-5.5(H2O) P 2₁,P 2₁/m Mono

VII/C.05-20 Krautite MnAsO3(OH)2·(H2O) P 2₁ 2

VII/C.05-30 Sterlinghillite Mn3(AsO4)2·3(H2O) Mono Mono

Other Krautite Information

References:

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

See Also:

Links to other databases for Krautite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Krautite

MnAs+++++O3(OH)2·(H2O)
Dana No: 39.1.3.1 Strunz No: VII/C.05-20
Locality:

Notes: