Kratochvílite
A valid IMA mineral species - grandfathered
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About Kratochvílite
Formula:
C13H10
Colour:
Colorless
Specific Gravity:
1.206
Crystal System:
Orthorhombic
Name:
To honor Josef Kratochvíl (28 July 1878, Caslav, Czech Republic - 1 November 1958, Prague, Czech Republic), petrographer and professor, Charles University, Prague, Czech Republic. He wrote the eight-volume work, 'The Topographic Mineralogy of Bohemia'.
Organic compound formed in burning pyritic shale or coal fires. It is uncertain whether kratochvíllite is the chemical fluorene (more specifically: 9H-fluorene) (C13H10) or anthracene (C14H10) - further study of type material needed.
Note (04.04.2020): seems like it is fluorene, as "anthracene" is now approved as freitalite.
Both compounds are well-known polycyclic aromatic hydrocarbons (PAHs), and their structural formulas are (CH)4C2(CH2)C2(CH)4 (also known as tricyclo[7.4.0.02,7]trideca-2,4,6,9,11,13-hexaene, that is, two benzene rings fused with a single cyclopentane one) and (CH)4C2(CH)2C2(CH4)4 (also known as tricyclo[8.4.0.03,8]tetradeca-1,3,5,7,9,11,13-heptaene, i.e., three benzene rings fused), respectively.
Note (04.04.2020): seems like it is fluorene, as "anthracene" is now approved as freitalite.
Both compounds are well-known polycyclic aromatic hydrocarbons (PAHs), and their structural formulas are (CH)4C2(CH2)C2(CH)4 (also known as tricyclo[7.4.0.02,7]trideca-2,4,6,9,11,13-hexaene, that is, two benzene rings fused with a single cyclopentane one) and (CH)4C2(CH)2C2(CH4)4 (also known as tricyclo[8.4.0.03,8]tetradeca-1,3,5,7,9,11,13-heptaene, i.e., three benzene rings fused), respectively.
Unique Identifiers
Mindat ID:
2269
Long-form identifier:
mindat:1:1:2269:5
GUID
(UUID V4):
(UUID V4):
9efe9763-669a-4b47-b483-9bd7de44f8e5
IMA Classification of Kratochvílite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1937
Classification of Kratochvílite
10.BA.25
10 : ORGANIC COMPOUNDS
B : Hydrocarbons
A : Hydrocarbons
10 : ORGANIC COMPOUNDS
B : Hydrocarbons
A : Hydrocarbons
50.3.1.1
50 : ORGANIC COMPOUNDS
3 : Hydrocarbons
50 : ORGANIC COMPOUNDS
3 : Hydrocarbons
32.4
32 : Hydrocarbons, Resins and other Organic Compounds
32 : Hydrocarbons, Resins and other Organic Compounds
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ktc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Kratochvílite
Transparency:
Translucent
Colour:
Colorless
Density:
1.206 g/cm3 (Measured) 1.197 g/cm3 (Calculated)
Optical Data of Kratochvílite
Type:
Biaxial (+)
RI values:
nα = 1.578 nβ = 1.663 nγ = 1.919
Max Birefringence:
δ = 0.341
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
very weak
Chemistry of Kratochvílite
Mindat Formula:
C13H10
Elements listed:
Crystallography of Kratochvílite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 8.50 Å, b = 5.71 Å, c = 19.00 Å
Ratio:
a:b:c = 1.489 : 1 : 3.327
Unit Cell V:
922.17 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space Group: P nam.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.68 Å | (100b) |
9.39 Å | (70) |
4.21 Å | (70b) |
3.79 Å | (50) |
3.38 Å | (90) |
2.54 Å | (60) |
2.45 Å | (50) |
Comments:
Data for synthetic C13H10.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Stage 10b: Anthropogenic minerals | <10 Ka |
54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Kratochvílite
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Burning pyritic shale.
Associated Minerals at Type Locality:
Reference:
Rost, R. (1937) The minerals of the burning coal heaps in the vicinity of Kladno. Rozpravy Ceske Akademie: Kl II: 47(11): 6 pp.
Synonyms of Kratochvílite
Other Language Names for Kratochvílite
Common Associates
Related Minerals - Strunz-mindat Grouping
10.BA. | Freitalite | C14H10 |
10.BA.05 | Fichtelite | C19H34 |
10.BA.10 | Branchite | C20H34 |
10.BA.15 | Dinite | C20H36 |
10.BA.20 | Idrialite | C22H14 |
10.BA.30 | Carpathite | C24H12 |
10.BA.35 | Phylloretine | C18H18 |
10.BA.40 | Ravatite | C14H10 |
10.BA.45 | Simonellite | C19H24 |
10.BA.50 | Evenkite | C21H44 |
10.BA.55 | Wampenite | C18H16 |
10.BA.60 | Scharizerite |
Fluorescence of Kratochvílite
SW UV: Bright blue-violet.
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.
Internet Links for Kratochvílite
mindat.org URL:
https://www.mindat.org/min-2269.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Kratochvílite
Reference List:
Localities for Kratochvílite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Zacek et al. (1995) |
| American Mineralogist (1938) |
| Žáček et al. (1998) |
| Dalibor Matýsek |
Germany | |
| Witzke et al. (2015) |
Poland | |
| Fabiańska et al. (2015) |
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Kateřina Coal Mine, Radvanice, Trutnov District, Hradec Králové Region, Czech Republic