Heulandite Rough Stone- Per Kilo

Heulandite is one of the more common zeolite minerals. It has a very distinctive crystal form and has a noticeable pearly luster on cleavage surfaces. Since its original classification, Heulandite was always regarded as a single mineral species with a variable elemental makeup. In 1997, the Zeolite Subcommittee of the IMA divided this mineral into individual sub-species, thereby regarding Heulandite as a series of four members. The series is defined by the presence of several variable elements in the following order: calcium, sodium, potassium, strontium, and barium. Calcium-dominating Heulandite is called Heulandite-Ca, and is by far the most prevalent form of this series. Sodium-dominating Heulandite is the next most common, and is known as Heulandite-Na, followed by potassium-dominating Heulandite known as Heulandite-K. Strontium-dominating Heulandite is known as Heulandite-Sr, and is very uncommon. A new barium-dominating Heulandite was classified in 2002, and is known as Heulandite-Ba.