Comprising six different agate geode halves with exposed internal cavities, one a cut section showing an amethyst lined cavity on both sides. 1.07 kg total, 48-97 mm



From Brazil. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.

On a rectangular matrix, showing some good detail, an outline of another specimen visible on the lower edge. 1.62 kg, 23 cm



Ex Lincolnshire, UK, collection.

A Knightia alta fish on a rounded limestone matrix. 43 grams, 84 mm



From a private Tyneside collection, formed since the early 2000s.

Comprising three wind-rounded pebbles in hollowed out 'nests'; each with a hessian draw-ribbon pouch. 490 grams total, 60-68 mm



From the Kalahari Desert. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.

A cut section of a geode with prismatic deep purple amethyst crystals. 5.9 kg, 31 cm



From the private collection of author and historian Dr DeWitt Bailey, one of the global authorities on the confederate army in the US civil war; thence by descent to his grandson.

Irregular sections of pink dolomite sheets with marcasite inclusions. 1.37 kg total, 5.5-10.4 cm



Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.

Carved from fossiliferous stone with a Goniatite sp. set at the top. 522 grams, 16.5 cm



From a Cambridgeshire, UK, collection. Property of a Cambridgeshire, UK, gentleman. Private collection, London.

A sandstone matrix with a Mosasaur prognathodon tooth an another fossil, likely from a fish. 195 grams, 96 mm



From a Cambridgeshire, UK, collection.

An ammonite-shaped dish carved from fossiliferous stone, set with a Goniatite sp. ammonite. 127 grams, 10.6 cm



From Morocco, North Africa. From a Cambridgeshire, UK, collection.

A section of white stalagmite showing natural ripples to one face. 2.28 kg, 39 cm



Ex West Country, UK, collection, 1990s.

A composite matrix set with five Mosasaur prognathodon teeth. 1.44 kg, 17 cm



From Morocco, West Africa. Ex Cambridgeshire, UK, collection.

The Mosasaur is an extinct, large marine reptile dinosaur with an elongated body, long snout and paddle-like limbs. Found worldwide, they competed with other well-known sea predators of the Late Cretaceous, such as plesiosaurs and ichthyosaurs, for food, existing primarily on a diet of ammonoids, cuttlefish and fish.

Comprising ten large chunks in rich colour. 1.85 kg total, 58-84 mm



Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.