High quality tumblestones at 2-3cm in size. You can either buy these as single stones, or benefit from quantity discounts by purchasing larger amounts.
Scolecite is a member of the zeolite group, and is closely related to Natrolite and Mesolite. It forms a series with those two minerals, and is the calcium-rich end member. Chemical analysis or optical tests may be required to distinguish Scolecite from Natrolite, and a single crystal may even contain part of each mineral within different zones of the same crystal.