Very nice sample of Barrerite, with pearly, shiny and well-defined crystals, in excellent conditions. 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:30 gr.
 Crystal size:Up to 1,0 cm long
 Overall size: 62mm x 55 mm x 18 mm
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 Minservice (Sondrio - Italy) Minservice Galleries Main
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