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Chalk is a fine, porous, white form of limestone of Cretaceous age. Formed from the accumulation of coccoliths in a relatively deep marine environment. Supplied by weight, sizes vary.
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Chalk is a soft, white, porous sedimentary carbonate rock, a form of limestone. Cretaceous in age. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find chert or flint nodules embedded in chalk. Brilliant white chalk cliffs are a dominant feature of the Yorkshire coast & the south coast of England. Supplied by weight in lots of 1 kilo, pieces are random in size and come in a polythene bag with a data label.
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Red chalk is early Cretaceous in age. It is chemically very similar to the later & better known white chalk.
70 in stock
Lower Carboniferous crinoidal limestone from Derbyshire, U.K. Supplie dby weight in lots of 1 kg. Comes in a polythene bag with an information label.
Out of stock
Limestone, a common sedimentary rock often used in building and stone work. These samples are carboniferous in age and are supplied by weight in lots of 1 kg.
Out of stock
This red coloured Marl is a lime (Calcium Carbonate) rich mudstone from the Triassic of Gloucestershire. They are supplied in labelled card trays.
Tea Green Marl. A greenish grey dolomitic mudsone from the Triassic of Gloucestershire.
50 in stock
Chalk is a fine, porous, white form of limestone of Cretaceous age. Formed from the accumulation of coccoliths in a relatively deep marine environment.
299 in stock
Carboniferous coral limestone from Anglesey, North Wales. Composed largely of well preserved Lithostrotion corals, supplied in lots of 1 kilogram.
Out of stock
A Triassic red millet seed sandstone of aeolian desert origin. Samples come from Penrith, Cumbria and are supplied by weight.
Cannel coal by it’s physical morphology and low mineral content is considered to be coal but by its texture & organic matter content it is considered to be oil shale. Available by weight in lots of 1 kilogram.
Ribbon banded mudstone, Silurian in age, collected from the Denbigh grits in Wales, UK. Supplied by weight, the product will come in a 1 kilogram bag and the size of samples inside will vary.
Bituminous coal is a soft sedimentary rock with a high organic content & the tar-like substance Bitumen. It is of a lower grade than Anthracite but higher grade than Lignite. Supplied in lots of 1 kg.
Chert, a hard cryptocrystalline silica found as nodules & bands within the Cretaceous Chalk. Supplied by weight in 1 kilo bags.
25 in stock
Frosterley Marble is not a marble but a black limestone containing fossil coral specimens of Carboniferous age. The specimens are from Harewood quarry, Co. Durham, supplied by weight in lots of 1 kilogram.
Out of stock
Oolitic Limestone. Jurassic (Oxfordian) in age from the Malton Oolite & Coral Rag member. Generally much harder than the oolitic example from Gloucestershire. Supplied by weight with the size of pieces being random, comes in a polythene bag with an information label.
Out of stock
Devonian lower Old Red Desert Sandstone from Gloucestershire , sold loose in random sized pieces in a polythene bag by weight.
100 in stock
Greywacke, a hard, grey, poorly sorted sandstone of Silurian age. Available by weight in lots of 1 kilogram.
Stiperstones Orthoquartzite from the Cambrian period. A very pure, hard, well cemented sandstone. It is normally whitish or pale grey-buff in colour with occasional streaks of impurities. Supplied by weight in lots of 1 kilogram.
Out of stock
Torridonian Sandstone from Loch Kishorn, Scotland. The sandstone of pre-cambrian age and among the oldest rocks found in the British isles and gets its name from Torridon where it is found. Supplied by weight, sizes vary.
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