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A fine grained sandstone formed in estuarine (river mouth) conditions, composed of fine quartz and mica. Available by weight in 1 kilo bags with an information label.
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Estuarine sandstone as the name implies was laid down as fine cross bedded deposits at the mouths of rivers. Occasional marine incursions are evident from fossils & ripple bedding. Some of the fine beds are peppered with mica flakes. This example is from the Carboniferous of Derbyshire. Samples come by weight in bags of 1 kilo, sizes will vary.
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Cretaceous sandstone rock specimens from the Wealden group found in Philpots quarry, west Hoathly, Sussex. This sedimentary rock is formed in estuarine conditions and exhibits quartz and mica crystals, commonly used as a popular building stone.
48 in stock
Devonian lower Old Red Desert Sandstone from Gloucestershire , sold loose in random sized pieces in a polythene bag by weight.
100 in stock
Micaceous Sandstone. As the name suggests, this type of sandstone contains flakes of mica which can be seen glinting in the specimens.
Out of stock
A fine grained sandstone formed in estuarine (river mouth) conditions, composed of fine quartz and mica.
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.
A Triassic red millet seed sandstone of aeolian desert origin. Samples come from Penrith, Cumbria and are supplied by weight.
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
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
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.
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.
81 in stock
Carboniferous Millstone Grit found in Lancashire, once a popular building material due to its strength. Available by weight, comes in a 1 kg bag.
Out of stock
Carboniferous coral limestone from Anglesey, North Wales. Composed largely of well preserved Lithostrotion corals, supplied in lots of 1 kilogram.
Out of stock
This Breccia is a calcrete cemented scree deposit of Pleistocene age from the Manifold Valley in Staffordshire. Supplied by weight, comes in a thick polythene bag with an information label.
Out of stock
Conglomerate with well rounded clasts from Faringdon, UK. A good example of the lithotype as opposed to a Breccia which would contain predominantly angular to sub-angular clasts. Supplied by weight in bags weighing 1 kilo.
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.
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
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
Greywacke, a hard, grey, poorly sorted sandstone of Silurian age. Available by weight in lots of 1 kilogram.
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