User:Beancounter603/Barrerite
| Barrerite | |
|---|---|
 Barrerite from Kuiu Island, Alaska, USA. | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | Na,K,Ca)2Al2Si7O18·6(H2O) |
| Crystal system | Orthorhombic |
| Identification | |
| Color | White, Pink |
| Cleavage | Perfect |
| Mohs scale hardness | 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.
References http://www.mindat.org/min-536.html http://webmineral.com/data/Barrerite.shtml