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What are ultramines ?...

What are ultramines ?

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Ultramarines are aluminosilicates but do not contain water of hydration. Some extra anioins, like `CI^(-), S_(2)^(2-) and SO_(4)^(-2)`, may also be present in the cavities. Example of ultramarines are sodalite,
` Nag(AIO_(2))_(6)(SiO_(2))_(6)CI_(2)` , ultramarine, ` Na_(8) (AIO)_(2))_(6)(SiO_(2))_(6)S_(2)` and nosean,
`Na_(8)(AIO_(2))_(6)(SiO_(2))_(6)SO_(4)`, Many ultramarines are coloured and hence as pigments.
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