A quartz

Crystals of quartz, Madagascar. The image appears in the book Il ritmo delle forme - The r...

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Geometry in the caves

The various shapes of stalactites and stalagmites in a cave.

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Geometry in the caves

The various shapes of stalactites and stalagmites in a cave.

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Stratifications

The geometry of the stratifications of lava in Linosa.

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Granato

Il cristallo del granato ha la forma di un dodecaedro rombico. Si può ottenere una sua...

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Pietre e colori

Una classificazione di pietre a Gerusalemme, al mercato della città vecchia.

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Geometry in the caves

The various shapes of stalactites and stalagmites in a cave.

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A crystal

Crystals provide interesting examples of polyhedra.

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A crystal of flourite

A crystal of flourite, that has the shape of a regular octahedron.The image appears in the...

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A crystal of cubic pyrite

We find the cubes in nature, for example, in a crystal of cubic pyrite. The image has been...

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