It is associated with other zeolites such as stilbite and heulandite. It is frequently associated with other zeolites, including stilbite and heulandite. It can be found on top of the calcium zeolites heulandite, stilbite and epistilbite. Associated minerals include quartz, apophyllite, babingtonite, heulandite, stilbite and other zeolites. Epistilbite is a distinct zeolite species unrelated to stilbite. It occurs with cavansite, heulandite, stilbite, analcime, apophyllite and calcite. Such minerals possess perfect cleavage, with examples including muscovite and stilbite. Minerals found in association with powellite include molybdenite, ferrimolybdite, stilbite, laumontite and apophyllite. Zeolite minerals such as chabazite and stilbite can also be found at Partridge Island. Nepheline in shonkinite from the is largely altered to natrolite and stilbite. The framework of stilbite is pseudo-orthorhombic with the open channels typical of zeolites. At one time heulandite and stilbite were considered to be identical minerals. Stilbite is a low-temperature secondary hydrothermal mineral. Stilbite has not been found in sedimentary tuff deposits or deep-sea deposits.