The structural types of copper, diamond and tungsten are represented by a linear union of four tetrahedrons over faces within solution of a general problem of representation of a crystal structure as a union of special atomic clusters. This union (a tetrablock) plays the role of a universal building unit, because it determines the generating clusters (building units) of the basic structural types considered. Spiral unions of these generating clusters are implemented in other structural types too, as well as in metallic liquids and glasses. Since symmetry is a geometrical equivalent for the physical requirement of minimal free energy in a system, the choice of such clusters is determined by purely symmetry (mathematical) considerations.

铜，金刚石和钨的结构类型由四个四面体在表面上的线性联合表示，在解决将晶体结构表示为特殊原子团簇的一般问题的解决方案中。该联合（四嵌段）扮演通用建筑单元的角色，因为它确定了所考虑的基本结构类型的生成类（建筑单元）。这些生成簇的螺旋结合也可以用其他结构类型实现，也可以用金属液体和玻璃实现。由于对称性是系统中最小自由能的物理要求的几何等效项，因此此类簇的选择由纯粹的对称性（数学）考虑决定。