Mineralogy
Cyclosilicates

"Cyclosilicates": ring silicates - SiO3


3-member ring - Si3O9 

4-member ring - Si4O12 

6-member ring - Si6O18
e.g., beryl, tourmaline
Si:O ratio is 1 : 3

Examples of Cyclosilicates:

    Beryl Be3Al2Si6O18

    Tourmaline (Na,Ca)(Li,Mg,Al)(Al,Fe,Mn)6(BO3)3(Si6O18)(OH)4


 

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