Stellerite

Stellerite is a mineral from the silicate group, belonging to the zeolite family, composed of hydrated calcium and aluminum silicate. It typically occurs in spherical, lamellar, or rosette aggregates, with colors ranging from white to colorless, sometimes slightly pinkish or yellowish.

It primarily forms in cavities of volcanic rocks, notably in India, Iceland, and Japan, often associated with other zeolites like stilbite.