Barrerite

Infobox mineral
name = Barrerite
Category = Tectosilicate
family = Zeolite
boxwidth = 50
boxbgcolor = blue


imagesize = 200
caption = Barrerite from Kuiu Island, Alaska, USA.
formula = Na,K,Ca)2Al2Si7O18·6(H2O)
color = White, Pink
system = Orthorhombic
cleavage = Perfect
mohs = 3 - 4
luster = Vitreous-glassy
streak = White
density = 2.13

Barrerite is a Tectosilicate mineral and a member of the Zeolite family. It is one of the rarer zeolites and found only at Rocky Pass, Kuiu Island, Alaska. It was named for Richard Maling Barrer (1910- ), a British teacher born in New Zealand

Barrerite crystal are white to pinkish, with a vitreous-glassy luster. The crystal system is Orthorhombic and is flat and tabular in appearance. It has a Mohs hardness of 3 to 4 and its cleavage is perfect. Barrerite has a white streak and a density of 2.13. The crystal are found on only one place on earth in crystal fissures on Kuiu Island, off the coast of Alaska.

Referenceshttp://www.mindat.org/min-536.htmlhttp://webmineral.com/data/Barrerite.shtml