Barrerite is a very rare zeolite species, found in less than two dozens localities in the world. Even though the type locality for the species is in Italy, the best and most well-known examples of the species are those from Kuiu Island in Alaska. This is an elegant and showy display specimen loaded with compresssed, platy, white, slightly gemmy, tabular, pseudo-hexagonal (orthorhombic) crystals of Barrerite up to 1,0 cm on host rock matrix. Mineral by now almost impossible to find, once it was collected on the seashore, in the few hours when the tide lowered enough to allow the collection.
Formula :
(Na2,Ca,K2)[Al2Si7O18] * 7 H2O
System: orthorhombic Hardness:3-4 Rarity:very rare
Strunz id:VIII/J.23-40 -
SILICATES
Name origin: Named for Richard Maling Barrer (1910-1996), New Zealand-born British teacher and student of the chemistry of zeolites
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 Specimen weight:37 gr.
 Crystal size:Up to 1,0 cm long
 Overall size: 45mm x 40 mm x 18 mm
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