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Chemical Composition: CaAl2Si7O18·7H2O
or Al2O3(Ca,Ma2)O·6SiO2·6H2O
Group: -
System: Monoclinic
Family: Phosphates
Hardness: 3.5
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- Small, hexagonal, prismatic crystals, sometimes with curved
faces
- Fibrous
- Perfect cleavage
- Nonmetallic, vitreous to pearly luster
- Other colours: colourless, yellow-brown
- Light
- Translucent
- Soluble in acids and fuses easily
- White streak
- Specific gravity 2.1
- Common
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