Kutnohorite Mineral Data

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.

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Kutnohorite

Electron Density:

r_electron=3.03 gm/cc
note: r_Kutnohorite=3.08 gm/cc.

Fermion Index

Fermion Index = 0.00588
Boson Index = 0.99412

Photoelectric:

PE_Kutnohorite= 7.48 barns/electron
U=PE_Kutnohorite x r_electron= 22.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kutnohorite is Not Radioactive

Kutnohorite Classification

Dana Class:

14.2.1.3 (14)Anhydrous Carbonates

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

(14.2.1)Dolomite Group (Trigonal: R3¯)

14.2.1.1 Dolomite CaMg(CO3)2 R 3 3

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

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

14.2.1.4 Minrecordite CaZn(CO3)2 R 3 3

Strunz Class:

V/B.03-30 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.03 - Dolomite group

V/B.03-10 Dolomite CaMg(CO3)2 R 3 3

V/B.03-20 Ankerite Ca(Fe,Mg,Mn)(CO3)2 R 3 3

V/B.03-30 Kutnohorite Ca(Mn,Mg,Fe)(CO3)2 R 3 3

V/B.03-40 Minrecordite CaZn(CO3)2 R 3 3

V/B.03-50 Norsethite BaMg(CO3)2 R 32 3 2

V/B.03-70 Huntite CaMg3(CO3)4 R 32 3 2

V/B.03-80 Benstonite (Ba,Sr)6(Ca,Mn)6Mg(CO3)13 R 3 3

Other Kutnohorite Information

References:

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

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Kutnohorite

Ca(Mn,Mg,Fe++)(CO3)2
Dana No: 14.2.1.3 Strunz No: V/B.03-30
Locality:

Notes: