Kutnohorite Mineral Data

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General Kutnohorite Information

Chemical Formula:

Ca(Mn,Mg,Fe++)(CO3)2

Composition:

Molecular Weight = 205.94 gm

Calcium 19.46 % Ca 27.23 % CaO

Magnesium 3.54 % Mg 5.87 % MgO

Manganese 16.01 % Mn 20.67 % MnO

Iron 2.71 % Fe 3.49 % FeO

Carbon 11.66 % C 42.74 % CO₂

Oxygen 46.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺_0.6Mg_0.3Fe²⁺_0.1(CO₃)₂

IMA Status:

Valid Species (Pre-IMA) 1901

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after its locality in Czechoslovakia.

Name Pronunciation:

Kutnohorite + Pronunciation

Synonym:

ICSD 202247

Kutnahorite

PDF 11-345

Kutnohorite Image

Images:

Kutnohorite

Comments: Light-pinkish, parallel bundles of kutnohorite crystals on matrix.
Location: Wessels mine, Hotazel, Kuruman District, South Africa. Scale: 5 x 4.7 x 3 cm.
© Fabre Minerals

Kutnohorite Crystallography

Axial Ratios:

a:c = 1:3.36907

Cell Dimensions:

a = 4.85, c = 16.34, Z = 3; V = 332.86 Den(Calc)= 3.08

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 2.94(1), 1.814(0.3), 1.837(0.25),

Forms:

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Forms: ( 1 0 1)

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Crystal Structure:

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Graf D L , American Mineralogist , 46 (1961) p.1283-1316, Crystallographic tables for the rhombohedral carbonates, Note: Disordered model

View Additional jPOWD Structure files for Kutnohorite
[1] [2]

Physical Properties of Kutnohorite

Cleavage:

{1011} Perfect, {1011} Perfect, {1011} Perfect

Color:

White, Light yellow, Light pink.

Density:

3.1 - 3.12, Average = 3.11

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Kutnohorite

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2049,KPDmeas= 0.2029,KC= 0.2064
Ncalc = 1.64

Optical Data:

Uniaxial (-), e=1.535, w=1.727, bire=0.1920.

Calculated Properties of Kutnohorite

Electron Density:

Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Kutnohorite =3.08 gm/cc.

Fermion Index:

Fermion Index = 0.0058852001
Boson Index = 0.9941147999

Photoelectric:

PE_Kutnohorite= 7.48 barns/electron
U=PE_Kutnohorite x rElectron Density= 22.63 barns/cc.

Radioactivity:

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

Kutnohorite Classification

Dana Class:

14.02.01.03 (14)Anhydrous Carbonates

(14.02)with Compound Formula A+ B++ (CO3)2

(14.02.01)Dolomite Group (Trigonal: R-3)

14.02.01.01 Dolomite CaMg(CO3)2 R 3 3

14.02.01.02 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3

14.02.01.03 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3

14.02.01.04 Minrecordite CaZn(CO3)2 R 3 3

Strunz Class:

05.AB.10 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AB -Alkali-earth (and other M2+) carbonates

05.AB.10 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3

05.AB.10 Dolomite CaMg(CO3)2 R 3 3

05.AB.10 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3

05.AB.10 Minrecordite CaZn(CO3)2 R 3 3

Other Kutnohorite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

See Also:

Links to other databases for Kutnohorite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST
19 - theimage

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

Kutnohorite

Ca(Mn,Mg,Fe++)(CO3)2
Dana No: 14.02.01.03 Strunz No: 05.AB.10
Locality:

Notes: