Each with two polished faces, some translucent. 731 grams total, 35-59 mm



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

A large cluster of silicon carbide showing beautiful iridescence. 1 kg, 16 cm



From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.

Carborundum rarely occurs in nature, but is commercially formed by heating carbon and silicon at very high temperatures, producing extremely strong bands of crystals.

Comprising three graduated obelisks, two with facetted edges, one hexagonal. 110 grams total, 6.2-10 cm



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

Displaying vivid lemon yellow colour. 1.1 kg total, 38-55 mm



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

Showing a number of Horodyskia williamsii macrofossil imprints; information sticker to reverse with inked collector's note 'Pingandy Station'. 174 grams, 79 mm



Found Pingandy Station, Western Australia. From a Leicestershire, UK, collection.

Previously described informally as a ‘string of beads’, assigned to the genus Horodyskia, and is considered one of the oldest known eukaryotes.

A large, curving section of Mammuthus primigenius tusk, showing the internal layering; stabilised. 5.46 kg, 79 cm



From the North Sea. Acquired from Milton Keynes Geological Society in 1999. From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.

Comprising fifteen rounded clusters of flattened crystals. 1.19 kg total, 47-62 mm



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

Mammuthus primigenius tusk section. 112 grams, 10.8 cm



From the North Sea, UK. Ian Wilkinson collection, Nottinghamshire, UK, formed since 1985.

A mixed group of red and leopard's skin jasper pebbles. 457 grams total, 19-42 mm



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

A shallow bowl carved from fossiliferous stone, showing a section of a large Orthoceras sp. specimen. 218 grams, 12 cm



From a Cambridgeshire, UK, collection.

Comprising variously sized geode halves, one with quartz crystal clusters and another with amethyst crystals to the exposed internal cavity. 1.13 kg total, 50-86 mm



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

A mixed group of variously shaped and sized crystals and fragments. 898 grams total, 1-20 mm



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