Sand Balls.
These specimens are aggregates of Quartz and Feldspar, with a compact, spherical morphology.
Their formation took place during the Cretaceous period, approximately 90 million years ago.
Origin: Segovia (Spain)
These specimens come from old quarry extractions in the region.
Size: 13 to 15 cm approx.
Weight per unit: 1 to 2.9 kg approx.
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