A freeform mass of cooled molten rock, collector's label to one side. 390 grams, 10cm



From Teidi, Tenerife, Spain. De-acquisitioned from a private Cornwall, UK, collection.)

Comprising two polished slices of fossilised wood, an irregular slice of rhodonite, and dendritic jasper. 1.4 kg total, 11.2-23 cm



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

A graduated set displaying brown banding and white crystals to the centre. 640 grams total, 8.5-11.2 cm



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

Comprising one hundred partly tumbled pebbles, remains of slurry to the pebbles. 1.45 kg total, 19-41 mm



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

Comprising three rounded matrices, each with a Knightia alta specimen. 145 grams total, 63-74 mm



From Wyoming (Green River Formation), USA. From a Lincolnshire, UK, collection.

In southwest Wyoming (and parts of Colorado and Utah) in the Green River Formation are found some of the world's most outstanding specimens of fossil fish. The Green River system was composed of three lakes: Lake Ulinta, Lake Gosiute and Fossil Lake. These Eocene lakes lay in a series of intermountain basins formed by geological events that uplifted the Rocky Mountains during the early Tertiary time. The climate was much different from the desert-like climate of this area today. Both the fauna (crocodiles, alligators, boa constrictors and some subtropical fish families) and the flora (such as large palm trees) indicate a climate much like that found along the Gulf Coast today. Large amounts of ash found in the sediments indicate that volcanoes were particularly active at this time.

Comprising three small obelisks in vibrant purple colour. 59 grams total, 47-52 mm



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

Comprising two irregular sections, one dark green with red and grey banding, one pale purple with light green and red banding. 3.35 kg total, 16.5-22 cm



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

The group composed of large vivid pink specimens. 3.36 kg total, 66-82 mm



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

A composite nodule with dyed vivid pink quartz crystals. 88.6 grams total, 50 mm each



Ex Cambridgeshire, UK, collection.

Comprising ten variously sized parallelepiped translucent specimens displaying birefringence. 1.54 kg total, 40-62 mm



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

A freestanding textured matrix set with Orthoceras and Goniatite specimens. 1.99 kg, 25.1 cm



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

An irregular matrix containing Arnioceras sp. (?) and Cymbite ammonites. 512 grams, 12.5 cm



From the Yorkshire coast. From a Lincolnshire, UK, collection.