A floater with only a very little area of conctact, that is completely made by chalcedony.
It's covered by several botryoidal spheres, whose color varies from violet to dark green to whitish.
It's called "Grape chalcedony"
 Specimen weight:320 gr.
 Crystal size:mm. 4
 Overall size: 150mm x 72 mm x 46 mm
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