KratochvÃlite
Kratochvílit, also known as Kratochwilit or under 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 ( C6H4 ) 2CH2 (or simply C13H10 ) and developed mostly small, tabular to platy crystals of pearly shiny blue violet to greenish color. Even colorless to white crystals are known.
Special Features
Kratovílit secretes a strong smell of petroleum and shows under short-wave UV light, a strong blue-violet fluorescence.
Etymology and history
Was first found and described Kratochvílit 1937 in the region around Kladno (Czech Republic). It was named after the mineral Josef Kratochvil (1878-1958), a Czech professor of petrography.
Classification
In the old classification of minerals (8th Edition) by Strunz Kratovílit one of the nitrogen-free hydrocarbons. The new classification of minerals according to Strunz ( 9th edition ) by the mineral in the Department of hydrocarbons.
The classification of minerals according to Dana assigns the Kratovílit in the department of " Salts of Organic Acids ( Hydrocarbons )" ( salts of organic acids and hydrocarbons).
Education and Locations
Kratovílit forms in burning, containing pyrite shale deposits and coal deposits (coal fire ).
As localities are known except its type locality Kladno only Radvanice v Čechách / Okres Trutnov in the Czech Republic and in Alsdorf / Aachen region in Germany.
Crystal structure
Kratochvílit crystallizes in the orthorhombic crystal system, space group ( Raumgruppen-Nr. 33) with the lattice parameters a = 8.514 Å, b = 5.744 Å and c = 18.52 Å and four formula units per unit cell.