Kratochvílite
A rare organic mineral — the hydrocarbon fluorene — deposited by burning coal and shale beds.
Intro adapted from Wikipedia (CC BY-SA).
Kratochvílite is an IMA-recognized mineral species in the organic mineral class, with the chemical formula C₁₃H₁₀.
It crystallizes in the orthorhombic crystal system (space group Pnam).
Key properties: specific gravity 1.206.
IMA symbol Ktc, grandfathered status — known before the IMA’s founding, named in 1937.
Formed as a result of burning pyritic shale (Kladno, Czech Republic).
The mineral was named to honor Professor Josef Kratochvı́l (1878–1958), Czech petrographer, Charles University, Prague, Czech Republic.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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