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Polyhedra in nature

tetrahedron antimony sodium sulphate
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.
octahedron rough diamond
Even a rough diamond clearly conveys the shape of an octahedron. After grinding, the stone corresponds exactly to the geometric shape of the octahedron.
treated diamond octahedron
perovskite molecule octahedron
The structure of the perovskite molecule, the chemical formula is CaTiO3, exactly corresponds to the correct polyhedron.
perovskite octahedron
Spinel octahedron
Spinel. The stone got its name from the Latin "sp'inella" - a small thorn.
Spinel octahedron
salt crystals cube
Cube - single crystal combines the crystals of salt NaCl.
salt crystals cube
Pyrite crystal dodecahedron
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.
boron crystal icosahedron
Bor - has the shape of an icosahedron


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Flexible polyhedra

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The most durable construction

Which geometric solid known to us has the greatest strength? Which is most resistant to external...

Practical apply

When we demonstrate polyhedra assembled from the Magic Edges set, people often ask the same...

Polyhedra in architecture. Part 3. The Lighthouse of Alexandria

The Lighthouse of Alexandria, one of the Seven Wonders, was built in the 3d century BC in an...

Truncated great dodecahedron from metal

The monument to the “Truncated large dodecahedron” polyhedron was discovered in Obninsk (Russia)...

School project

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