Checkerboard compound

A crystal structure with systematic compatible substitutions, that:

• is not synthesizable/accessible via conventional chemistry i.e.
  not accessible via cook mix and stir thermodynamic synthesis.
• is only synthesizable/accessible via mechanosynthesis/mechanochemistry.

Related

• Neo-polymorphs in Pseudo phase diagrams
• Classifications for gemstone like compounds

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• quasistatistic compounds – same idea but modifications seem random but they are in fact all intentional