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Details
LOT 2707
Spherical Sedimentary Concretion
4 in. (647 grams, 10.2 cm).
Naturally formed from hardened sediment with projecting porous, black stone nodules. [No Reserve]
Provenance
Acquired on the UK art market in the 1990s.
From the Dr Ince collection, N.W. London, UK.
Footnotes
A concretion is a compact mass of mineral matter, usually spherical or disc-shaped, and they vary greatly in size. They usually form early in the burial history of sediment, before the rest of the sediment has hardened into solid rock. Concretions occur when a considerable amount of cementing material collects locally around a nucleus, often organic (a leaf, tooth, a section of fossil or shell or dead matter) and commonly a marine invertebrate.
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