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Chemical Composition:
(Na,Ca)4-6Al6(Al,Si)4Si26O72·24H2O
Group: Zeolite
System: Monoclinic
Family: Silicates
Hardness: 3.5 - 4
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- Tabular crystals
- Perfect basal cleavage
- Vitreous or pearly luster
- Other colours: colourless, yellow, green
- Light, fragile
- Transparent or translucent
- Dissovles easily in HCl, leaving silica gel
- Fuses easily when heated
- Colourless streak
- Specific gravity 2.2
- Common
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