skup. spinelidů:

AB₂O₄

(Z = 8)

kde:

A = Co²⁺, Cu²⁺, Fe²⁺, Mg²⁺, Mn²⁺, Ni²⁺, Ti⁴⁺, Zn²⁺

B = Al³⁺, Cr³⁺, Fe²⁺, Fe³⁺, Mn³⁺, V³⁺

skup. granátů:

R₃²⁺R₂³⁺(SiO₄)₃

(Z = 8)

kde:

R²⁺ = Ca²⁺, Mg²⁺, Fe²⁺, Mn²⁺…

R³⁺ = Al³⁺, Fe³⁺, Cr³⁺…

skup. pyroxenů:

ABSi₂O₆

(Z = 4)

kde:

A = Ca²⁺, Fe²⁺, Li¹⁺, Mg²⁺, Na¹⁺

B = Al³⁺, Cr³⁺, Fe²⁺, Fe²⁺, Mg, Mn²⁺, Sc³⁺

skup. amfibolů:

A_0–1B₂Y₅Z₈O₂₂(OH,F,Cl)₂

(Z = 2)

kde:

A = Ca²⁺, Na¹⁺, K¹⁺

B = Ca²⁺, Fe²⁺, Li¹⁺, Mn²⁺, Mg²⁺, Na¹⁺

Y = Al³⁺, Cr³⁺, Fe²⁺, Fe³⁺, Mg²⁺, Mn²⁺, Ti⁴⁺

Z = Si⁴⁺, Al³⁺, Ti⁴⁺