Coordination polyhedra are geometric representations of how a cation is surrounded by an anion. In mineralogy, coordination polyhedra are often viewed as in terms of oxygen, thanks its abundance in the crust. The base device of silicate minerals would be the silica tetrahedron – just one Si4+ surrounded by 4 O2−. https://martinjwluc.bloggip.com/30058998/the-single-best-strategy-to-use-for-coq10