Ilsemannite
= Ilsemannite
{wiki=Ilsemannite}
Ilsemannite is a rare mineral that is a member of the zeolite group, specifically classified as a hydrous aluminosilicate. Its chemical composition is complex, primarily consisting of silicon, aluminum, oxygen, along with various cations such as sodium, potassium, and calcium. Ilsemannite typically occurs in volcanic or sedimentary environments and can form in hydrothermal deposits.