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In the natural environment, regular polyhedra can be found in the form of crystals (minerals). The form of the tetrahedron is transmitted by antimony sodium sulfate.

Even a rough diamond clearly conveys the shape of an octahedron. After grinding, the stone corresponds exactly to the geometric shape of the octahedron.

The structure of the perovskite molecule, the chemical formula is CaTiO_{3}, exactly corresponds to the correct polyhedron.

Spinel. The stone got its name from the Latin "sp'inella" - a small thorn.

Cube - single crystal combines the crystals of salt NaCl.

The pyrite crystal (pyrite FeS) is in the form of a dodecahedron. Pyrite (from the Greek. "Pir" - fire) - sulphurous iron or pyritic sulfur, the most common mineral from the group of sulphides. The size of pyrite crystals reaches several centimeters.

Bor - has the shape of an icosahedron

Semi-regular polyhedra are several groups of polyhedra: 1. Archimedean solids; 2. Catalan solids; 3....

Imagine a historic building, an architectural ensemble that is decorated with stellaled polyhedra....

Architects have used the elements of polyhedra in designing their constructions since ancient times....

Stamps cover all significant events happening in the world. Much attention was paid to polyhedra by...

In the second half of the 19th century, a new way of teaching was born in the US schools - the...

It is round, but nobody canceled the shape net of parts for its...

Quite often a question about a practical use of paper models pops up. What is the point of paper...