Cyanite, quartz, and leucite are grouped together because they all contain silicon in their chemical composition.
Silicon is the common element shared by cyanite (Al²SiO³), quartz (SiO₂), and leucite (KAISI²06). These minerals are grouped together because they all contain silicon in their chemical composition. Quartz and cyanite are examples of nesosilicates, while leucite belongs to the tectosilicates group.
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