(Želénky)
Former porcelanite ("porcelain jasper") deposit in North Bohemian lignite basin. This buchite occurrence was caused by fossil burning of a coal seam.
Apart from the listed minerals, Žáček et al. (2005) describe also CaFe4O7 ferrite, BaFe12O19 (related likely to magnetoplumbite-type barium hexaferrite), Ca2SiO4, Ca7MgSi4O16 and other unidentified Ca-, Mg- and Fe-bearing phases.
Ref.:
Žáček V., Skála R., Chlupáčová M., Dvořák Z. 2005: Ca-Fe3+-rich, Si-undersaturated buchite from Želénky, North-Bohemian Brown Coal Basin, Czech Republic. Eur. J. Mineral., 17, 623-633
