A large polished agate slice, Minas Gerais, Brazil. 18 x 27½ x 3 in (46 x 70 x 7.5 cm), 20 x 27.5 x 4 in (51 x 70 x 10 cm) on base. Estimate £3,000-5,000. Offered in  Sculpted by Nature Fossils, Minerals and Meteorites, 14-28 October 2020, Online
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