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Natural polyhedra

Natural polyhedra

In natural environments regular polyhedra can be found in the form of crystals (minerals). 
Sodium sulphate reminds the shape of tetrahedron.

октаэдр - необработанный алмаз

Even a rough diamond clearly reflects the shape of octahedron. After the grinding this mineral corresponds accurately to the geometric shape of an octahedron.

октаэдр - обработанный алмаз

молекула перовскита - октаэдр

октаэдр перовскит

шпинель - октаэдр

Spinel. Its name comes from a Latin word "sp'inella", which means "a small thorn".

Шпинель - октаэдр

куб - соль

Cube. The single crystal combines several crystals of salt NaCl. 

куб - молекула поваренной соли

Пирит - додекаэдр

A crystal of pyrite (sulfur pyrite FeS) has the shape of a dodecahedron. Pyrite (from the Greek. "pyr" - fire) is an iron sulfide or iron pyrite; it is the most common mineral from the group of sulfides. Some pyrite crystals may reach a few centimeters.

бор - икосаэдр

Boron has the shape of icosahedron.

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