Kratochvílite

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Kratochvílite
General
Category Organic mineral
Formula
(repeating unit)
C13H10
Strunz classification 10.BA.25
Crystal system Orthorhombic
Crystal class Pyramidal (mmm)
Space group Orthorhombic
H-M symbol: (mm2)
Space group: Pnam
Identification
Color White
Streak White
References [1][2]

Kratochvilite is a rare organic mineral formed by combustion of coal or pyritic black shale deposits. It is a hydrocarbon with the formula of either C13H10 or (C6H4)2CH2. It is a polymorph of the aromatic hydrocarbon fluorene. It forms white, yellow to brown crystals in the orthorhombic system which occur often as a druzey encrustation. It has a specific gravity of 1.21 and a Mohs hardness of 1 to 2.

It was first described from the Nejedly mine in Bohemia, Czech Republic in 1937.

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