Kratochvílit
| Kratochvílit | |
|---|---|
| General and classification | |
| chemical formula | (C 6 H 4 ) 2 CH 2 or C 13 H 10 |
|
Mineral class (and possibly department) |
Organic compounds - hydrocarbons |
|
System no. to Strunz and to Dana |
10.BA.25 ( 8th edition : IX / B.02) 03/50/01/01 |
| Crystallographic Data | |
| Crystal system | orthorhombic |
| Crystal class ; symbol | orthorhombic-pyramidal: mm 2 |
| Room group (no.) | Pna 2 1 (No. 33) |
| Lattice parameters | a = 8.514 Å ; b = 5.744 Å; c = 18.52 Å Please complete the source as an individual reference |
| Formula units | Z = 4 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 1 to 2 |
| Density (g / cm 3 ) | 1.206 to 1.197 |
| Cleavage | Please complete |
| colour | colorless, white, greenish, blue-violet |
| Line color | White |
| transparency | translucent |
| shine | Pearlescent |
| Crystal optics | |
| Refractive indices |
n α = 1.578 n β = 1.663 n γ = 1.919 |
| Birefringence | δ = 0.341 |
| Optical character | biaxial positive |
| Other properties | |
| Special features | fluorescence |
Kratochvílite , also known as kratochwilite or by its chemical name fluorene , is a rarely occurring mineral from the mineral class of organic compounds . It crystallizes in the orthorhombic crystal system with the chemical composition (C 6 H 4 ) 2 CH 2 (also simplified C 13 H 10 ) and usually develops small, tabular to platy crystals of pearlescent blue-violet to greenish color. Colorless to white crystals are also known.
Special properties
Kratovílit gives off a strong odor of petroleum and shows a strong blue-violet fluorescence under short-wave UV light .
Etymology and history
Kratochvílit was first found and described in 1937 in the region around Kladno (Czech Republic). The mineral was named after Josef Kratochvíl (1878–1958), a Czech professor of petrography .
classification
In the old systematics of minerals (8th edition) according to Strunz , kratovílite belongs to the nitrogen-free hydrocarbons . The new system of minerals according to Strunz (9th edition) sorts the mineral into the hydrocarbons department.
The systematics of minerals according to Dana assigns the kratovílit to the division of "Salts of Organic Acids (Hydrocarbons)" (salts of organic acids and hydrocarbons).
Education and Locations
Kratovílit forms in burning, pyrite-containing slate deposits or coal deposits ( coal fire ).
In addition to its type locality Kladno, only Radvanice v Čechách / Okres Trutnov in the Czech Republic and near Alsdorf / Aachen city region in Germany are known.
Crystal structure
Kratochvílit crystallizes in the orthorhombic crystal system in the space group (space group no. 33) with the lattice parameters a = 8.514 Å , b = 5.744 Å and c = 18.52 Å as well as four formula units per unit cell .
See also
Individual evidence
- ↑ a b Kratochvílite at mindat.org (engl.)
- ↑ Stefan Weiß: The large Lapis mineral directory . 4th edition. Christian Weise Verlag, Munich 2002, ISBN 3-921656-17-6 .
- ↑ Webmineral - New Dana Classification of Organic Minerals .
- ↑ Mindat - Localities for Kratochvílite (Engl.).
See also
literature
- Paul Ramdohr , Hugo Strunz : Klockmann's textbook of mineralogy . 16th edition. Ferdinand Enke Verlag, 1978, ISBN 3-432-82986-8 , pp. 799 .
Web links
- Mineral Atlas: Kratochvílit (Wiki)
- Mineral data sheet Kratochvílite (PDF, 61.8 kB, English)