Specimen of button spotted coal, 'Pot Bottom', from the deep winning of the 5 feet coal, on the north march of the Estate of Mar, at the village of New Sauchie, Clackmannanshire

One of a group of specimens from the Pennsylvania coalfields and elsewhere - a sample of bituminous coal with mineral charcoal from Mercer County, western Pennsylvania

One of a group of specimens from the Pennsylvania coalfields and elsewhere - a sample of bituminous coal from Smithport, McKean County, Pennsylvania

One of a group of specimens illustrating iron ores and the smelting of pig-iron - a sample of junction of parrot coal and lower band ironstone, in three pieces

One of a group of specimens illustrating iron ores and the smelting of pig-iron - a sample of splint coal from Redding, Stirlingshire

One of a collection of rocks and minerals from Southern Africa - samples of coal from River Revubue opposite Tete, Mozambique.

Specimen of coal from the Naga Hills, Assam

Sample of Dalkeith jewel coal

Sample of steam coal, from Cymru Colliery, Wales

Sample of steam coal, from Cymru Colliery, Wales

Sample of steam coal, from Cymru Colliery, Wales

Sample of steam coal, from Cymru Colliery, Wales

Sample of steam coal, from Cymru Colliery, Wales