Keywords: Natrolit 1.jpg Mineral natrolite chemical composition Na<sub>2</sub> Al<sub>2</sub>Si<sub>3</sub>O<sub>10</sub> ˘ 2 H<sub>2</sub>O Aluminosilicate from collection of National Museum Prague originally from Czech Republic Minerál natrolit ze sbĂrek NárodnĂho muzea pĹŻvodem z ÄŚech own Karelj 2008-04-20 Natrolite Geological and mineralogical Exhibition NM Prague |