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Kutnohorite

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Formula:
Ca(Mn,Mg,Fe)(CO
 
3
)
 
2
System:TrigonalColour:White, pale rose, pink, ...
Hardness:3½ - 4
Member of:Dolomite Group
Name:Named in 1901 by Antonín Bukovský for the type locality - Kutna Hora, Bohemia, Czech Republic.

Classification of Kutnohorite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/B.03-30
Nickel-Strunz 10th (pending) edition ID:5.AB.10

5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
B : Alkali-earth (and other M2+) carbonates
Dana 8th edition ID:14.2.1.3

14 : ANHYDROUS NORMAL CARBONATES
2 : AB(XO3)2
Hey's CIM Ref.:11.12.4

11 : Carbonates
12 : Carbonates of Mn
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Type Occurrence of Kutnohorite

Type Locality:Poličany, Kutná Hora (Kuttenberg), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic
Year of Discovery:1901

Occurrences of Kutnohorite

Geological Setting:Manganiferous sediments

Physical Properties of Kutnohorite

Diaphaneity (Transparency):Translucent
Colour:White, pale rose, pink, light to medium brown
Hardness (Mohs):3½ - 4
Tenacity:Brittle
Cleavage:Perfect
Perfect on {1011}
Fracture:Sub-Conchoidal
Density (measured):3.12 g/cm3
Density (calculated):3.15 g/cm3

Crystallography of Kutnohorite

Crystal System:Trigonal
Class (H-M):3 - Rhombohedral
Space Group:R3
Cell Parameters:a = 4.8518(3) Å, c = 16.217(2) Å
Ratio:a:c = 1 : 3.342
Unit Cell Volume:V 330.60 ų (Calculated from Unit Cell)
Z:3
Morphology:Polycrstalline spherules
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Kutnohorite

Type:Uniaxial (-)
RI values: nω = 1.710 - 1.727 nε = 1.519 - 1.535
Maximum Birefringence:δ = 0.191 - 0.192

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Kutnohorite

Formula:
Ca(Mn,Mg,Fe)(CO
 
3
)
 
2
Simplified for copy/paste:Ca(Mn,Mg,Fe)(CO3)2
Essential elements:C, Ca, Mn, O
All elements listed in formula:C, Ca, Fe, Mg, Mn, O

Relationship of Kutnohorite to other Species

Series:Forms a series with Ankerite (see here)
Member of:Dolomite Group
Other Members of Group:

- +
Ankerite
Ca(Fe
2+
 
,Mg)(CO
 
3
)
 
2
Dolomite
CaMg(CO
 
3
)
 
2
Minrecordite
CaZn(CO
 
3
)
 
2
Norsethite
BaMg(CO
 
3
)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
5.AB.05Calcite
CaCO
 
3
5.AB.05Gaspéite
(Ni,Mg,Fe)CO
 
3
5.AB.05Magnesite
MgCO
 
3
5.AB.05Otavite
CdCO
 
3
5.AB.05Rhodochrosite
MnCO
 
3
5.AB.05Siderite
FeCO
 
3
5.AB.05Smithsonite
ZnCO
 
3
5.AB.05Spherocobaltite
CoCO
 
3
5.AB.10Ankerite
Ca(Fe
2+
 
,Mg)(CO
 
3
)
 
2
5.AB.10Dolomite
CaMg(CO
 
3
)
 
2
5.AB.10Minrecordite
CaZn(CO
 
3
)
 
2
5.AB.15Aragonite
CaCO
 
3
5.AB.15Cerussite
PbCO
 
3
5.AB.15Strontianite
SrCO
 
3
5.AB.15Witherite
BaCO
 
3
5.AB.20Vaterite
CaCO
 
3
5.AB.25Huntite
CaMg
 
3
(CO
 
3
)
 
4
5.AB.30Norsethite
BaMg(CO
 
3
)
 
2
5.AB.35Alstonite
BaCa(CO
 
3
)
 
2
5.AB.40Olekminskite
Sr(Sr,Ca,Ba)(CO
 
3
)
 
2
5.AB.40Paralstonite
BaCa(CO
 
3
)
 
2
5.AB.45Barytocalcite
BaCa(CO
 
3
)
 
2
5.AB.50Carbocernaite
(Ca,Na)(Sr,Ce,Ba)(CO
 
3
)
 
2
5.AB.55Benstonite
(Ba,Sr)
 
6
(Ca,Mn)
 
6
Mg(CO
 
3
)
 
13
5.AB.60Juangodoyite
Na
 
2
Cu(CO
 
3
)
 
2
Related Minerals - Hey's Index Grouping:

- +
11.12.1Rhodochrosite
MnCO
 
3
11.12.2Holdawayite
Mn
 
6
(CO
 
3
)
 
2
(OH)
 
7
(Cl,OH)
11.12.3Desautelsite
Mg
 
6
Mn
3+
2
(OH)
 
16
[CO
 
3
] · 4H
 
2
O

Other Names for Kutnohorite

Synonyms:
KutnahoriteKutnohorriteKuttenbergite
Other Languages:
German:Kutnahorit
Kutnohorit
Russian:Кутногорит
Simplified Chinese:锰白云石
铁锰云石
镁菱锰矿
Spanish:Kutnahorita
Kutnohorita
Varieties:
Parakutnahorite

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Kutnohorite

Reference List:

- +
Bukowsky (1901) Anz. III Congress böhm. Naturfor. und Ärzte, Prague: 293.

Frondel, Clifford & L.H. Bauer (1955), Kutnahorite, a manganese dolomite, CaMn(CO3)2: American Mineralogist: 40: 748-760.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 217.

American Mineralogist (1987): 72: 319-328.

Powder Diffraction: 3: 172-174.

Neues Jahrbuch für Mineralogie, Monatshefte (1988): 539.

Internet Links for Kutnohorite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Kutnohorite details from Handbook of Mineralogy (PDF)
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    Localities for Kutnohorite

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