Analcime occurs as a primary mineral in analcime basalt and other alkaline igneous rocks. It also occurs as cavity and vesicle fillings associated with prehnite, calcite, and zeolites. Analcime forms in sedimentary rocks at temperatures below about , and so its presence indicates that the rock has experienced shallow diagenesis.
Analcime is a mineral found in igneous and sedimentary rocks, forming in alkaline environments and filling cavities in other minerals like prehnite, calcite, and zeolites. Its presence indicates shallow diagenesis of the rock it's found in.