Keywords: Apofilit 1.jpg Mineral apophillite chemical composition KCa<sub>4</sub> F OH Si <sub>4</sub>O<sub>10</sub> <sub>2</sub> x 8 H<sub>2</sub>O from collection of National Museum Prague Czech Republic originally from Czech Republic Minerál apofyllit ze sbírek Národního muzea v Praze původem z Čech own Karelj 2008-04-20 Apophyllite Geological and mineralogical Exhibition NM Prague |