A group of ten optical calcite specimens, each held in a white card collector's tray. 170 grams total, 18-22 mm

Very fine condition.

Durango, Mexico. Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's).

A boxed group of sand roses with flattened crystals on the c-axis, fanning open in variously shaped radiating clusters. 3.54 kg total including box, 18-59 mm



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

Three irregular matrices containing dawn redwood fossils, showing twig and needle leaves. 88.1 grams total, 46-55 mm



From a Cambridgeshire, UK, collection.

A Carcharocles megalodon shark tooth, with serrations and polished tooth enamel. 154 grams, 11.1 cm



From a Cambridgeshire, UK, collection.

Carcharodon megalodon is regarded as one of the largest and most powerful marine predators in vertebrate history and likely had a profound impact on the structuring of the marine communities. Fossil remains indicate that this giant shark reached a length of more than 16 metres (52 ft) and also affirm that it had a cosmopolitan distribution. Scientists suggest that in life it looked like a stockier version of the great white shark, Carcharodon carcharias.

Comprising three specimens with polished cut faces, showing strong banding and crystal-lined interior. 2.12 kg total including box, 9.2-16 cm



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

Comprising six polished slices in gently graduated sizes, cut from the same geode. 372 grams total, 8.8-10.2 cm



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

Boxed group of amethyst crystals on matrices exhibiting vibrant purple colour. 3.45 kg total including box, 22-56 mm



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

Comprising two Libellula doris larvae on an oval matrix; supplied in a glazed display case with an information ticket. 13.4 grams, 90 mm



From a Cambridgeshire, UK, collection.

Irregular geode matrix with light purple amethyst crystals; the metal branches tipped with polished quartz pebbles. 520 grams, 19.5 cm



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

Comprising two halves from the same geode, showing contrasting, nearly straight banding at the bottom with a quartz crystal-filled cavity above. 1.08 kg total, 10.9-11 cm



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

A boxed group of three polished geode sections showing contrasting colours and banding. 2.77 kg total, 9.6-19.6 cm



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

Boxed group of vibrant pink specimens in various sizes showing vitreous lustre. 3.99 kg total including box, 2.3-10.7 cm



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