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CH1012
SILICATES
Silicate
minerals are based on the
repeating unit [SiO44-].
repeating unit [SiO44-].
• Silicates other
than quartz
are anionic, with counterions
incorporated in the structure
to balance the charge.
eg Al3+
are anionic, with counterions
incorporated in the structure
to balance the charge.
eg Al3+
beryl
Be3Al2Si6O18
kaolinite
[Al2Si2O5(OH)4]2
Si2O52-
sheet silicate
- clay
- clay