Barrerite

specimen number:
2133237

location:
Rocky Pass, Kuiu Island, Alexander Archipelago, Alaska, USA

description:
Lustrous colorless crystals in a cluster without matrix. In great condition. Very choice for this species. Complete all around.

Barrerite is a rare zeolite mineral that belongs to the stilbite subgroup, characterized as a hydrated sodium calcium aluminum silicate. Geologically, it typically forms in the cavities of volcanic rocks, such as andesites or basalts, where hydrothermal fluids or low-grade metamorphic processes allow for the crystallization of its complex framework structure. It is notable for its orthorhombic symmetry, which distinguishes it from its monoclinic relatives like stilbite-Ca, and it usually appears as colorless to white, tabular crystals with a vitreous luster. Historically, the mineral was first identified in 1974 from specimens found at San Efisio in Sardinia, Italy, and was named in honor of the New Zealand chemist Richard Barrer for his pioneering work in zeolite science. While barrerite is not mined for industrial purposes due to its extreme rarity and limited distribution, it is highly valued by researchers and specialized collectors for its unique crystallographic properties. Notable occurrences beyond the type locality include sites in Alaska and British Columbia, where it continues to provide insight into the specific chemical environments required for sodium-rich zeolite formation.

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