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Kutnohorite

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Formula:
Ca(Mn,Mg,Fe)(CO3)2
System:
Trigonal
Colour:
White, pale rose, pink, ...
Hardness:
3½ - 4
Member of:
Name:
Named in 1901 by Antonín Bukovský for the type locality - Kutna Hora, Bohemia, Czech Republic.

Classification of Kutnohorite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
5.AB.10

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

14 : ANHYDROUS NORMAL CARBONATES
2 : AB(XO3)2
11.12.4

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

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:
3.12 g/cm3 (Measured)    3.15 g/cm3 (Calculated)

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:
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
Max Birefringence:
δ = 0.191 - 0.192
Image 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)(CO3)2
Essential elements:
All elements listed in formula:

Relationship of Kutnohorite to other Species

Series:
Forms a series with Ankerite (see here)
Member of:
Other Members of Group:
AnkeriteCa(Fe2+,Mg)(CO3)2
DolomiteCaMg(CO3)2
MinrecorditeCaZn(CO3)2
NorsethiteBaMg(CO3)2
5.AB.05CalciteCaCO3
5.AB.05Gaspéite(Ni,Mg,Fe)CO3
5.AB.05MagnesiteMgCO3
5.AB.05OtaviteCdCO3
5.AB.05RhodochrositeMnCO3
5.AB.05SideriteFeCO3
5.AB.05SmithsoniteZnCO3
5.AB.05SpherocobaltiteCoCO3
5.AB.10AnkeriteCa(Fe2+,Mg)(CO3)2
5.AB.10DolomiteCaMg(CO3)2
5.AB.10MinrecorditeCaZn(CO3)2
5.AB.15AragoniteCaCO3
5.AB.15CerussitePbCO3
5.AB.15StrontianiteSrCO3
5.AB.15WitheriteBaCO3
5.AB.20VateriteCaCO3
5.AB.25HuntiteCaMg3(CO3)4
5.AB.30NorsethiteBaMg(CO3)2
5.AB.35AlstoniteBaCa(CO3)2
5.AB.40OlekminskiteSr(Sr,Ca,Ba)(CO3)2
5.AB.40ParalstoniteBaCa(CO3)2
5.AB.45BarytocalciteBaCa(CO3)2
5.AB.50Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
5.AB.55Benstonite(Ba,Sr)6(Ca,Mn)6Mg(CO3)13
5.AB.60JuangodoyiteNa2Cu(CO3)2
11.12.1RhodochrositeMnCO3
11.12.2HoldawayiteMn6(CO3)2(OH)7(Cl,OH)
11.12.3DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O

Other Names for Kutnohorite

Name in Other Languages:

Other Information

Health Risks:
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

Specimens:
The following Kutnohorite specimens are currently listed for sale on minfind.com.

Localities for Kutnohorite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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