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Added Tue, 11/10/2016
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Spherical (sometimes flattened as if, correctly rounded) mineral aggregate radial-rayed structure. In terms of education allocate one-act concretions, the growth of which occurred without any significant stops, and multiple, when in the process of growth has initially formed a core around which was then the collective crystallization. In the kernel there may be accumulations of minerals of a different composition or organic residues. The sizes of these entities, from millimeters to tens of centimeters, and sometimes even up to a meter or more. Shapes can also vary.

Often mistaken for the details of the alien ships, the wreckage of a UFO and the like.

Translated by «Yandex.Translator»

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