Disilicates and Ring Silicates. Disilicates Not a common group of minerals – not rock forming Widely distributed Most common are the epidote group Epidote Zoisite Clinozoisite Allanite. Characteristic structure Pair of single tetrahedrons Share single O Z/O ratio = 2/7.
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Cross-linked double tetrahedron
A = 7 to 11 fold coordination
M1, M2, & M3 site
Variation of cations in A and M3 sites control names
Beryl and Cordierite
Si tetrahedral rings
Be in 4 fold coordination
Al in 6 fold coordination
W = Na, less commonly Ca, K
X = Mg & Fe, less commonly Mn, Li, Al
Y = Al, less commonly Fe, Mg
Trigonally coordinated B