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An ammonite pair, Speetoniceras sp., Russia, Jurassic Period (146-208 million years old), Estimate £3,500 – 4,500 (€3,500 – 4,500). Photo Bonhams.

Cut and polished, partially pyritised, on perspex display stands, 16.5ins.(42cm)wide, each. (2)

Note: A desirable ammonite from the Volga River. The presence of large amounts of iron during the fossilisation period results in pyritisation: a striking combination of Aragonite, Gold, Silver Pyrite crystals and brandy coloured Calcite.

Bonhams. GENTLEMAN’S LIBRARY SALE. 27 Jan 2015 11:00 GMT – LONDON, KNIGHTSBRIDGE

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