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Strange crystals

I wonder ... I can not understand what kind of crystals are formed? Something strange is geometrically correct and / Maybe someone in the know?
5 photos via Mertviy





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Source:
Pictures
Those who came before us?
Unexplained mysteries of the world (20 photos)
The oldest civilization on our planet
South Africa. "De Beers" Diamonds
Educational program on the map projection with pictures
Not dull world map
New Roomba building card rooms during cleaning (method SLAM)
Playing god at how AI has learned to win human
Map Creator — relief map, the age of which 120 million years
Classification of flower beds by type and flowering periods
...
Those who came before us?
...
Unexplained mysteries of the world (20 photos)
...
The oldest civilization on our planet
...
South Africa. "De Beers" Diamonds
...
Educational program on the map projection with pictures
...
Not dull world map
...
New Roomba building card rooms during cleaning (method SLAM)
...
Playing god at how AI has learned to win human
...
Map Creator — relief map, the age of which 120 million years
...
Classification of flower beds by type and flowering periods
 Give me a notebook in a circle ... (6 photos)  In Washington, the waist and above