Flintstones are silica concretion balls of spherical or oval or irregular shape. They usually occur as banks among carbonate rocks of the Jurassic (Zakrzówek, Julianka and Siedlec querries) or Cretaceous (Janików, Karsy, Mielnik and Kornica querries) ages. The main component is chalcedony.
Ground flintstones are used in glass and ceramic industry. They are also used for production of facings, millstones for rolling mills and flint abrasives. Striped flintstones are used to make some jewellery and stone fancy products.
The most famous accumulation is Krzemionki Opatowskie, located near Ostrowiec Świętokrzyski, where flintstones were extracted during 3,500-1,600 BC.
There are only two explored deposits of flintstones (Bocheniec and Tokarnia) near Kielce (Świętokrzyskie Voivodeship) which have not been exploited so far.
Prepared by: Dariusz Brzeziński