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Lignite or Brown Coal is a naturally compressed peat deposit. Lower grade than traditional coals & younger in age, in this case from the Miocene in Germany.
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Lignite, often referred to as Brown Coal is a soft combustible sedimentary rock form by the natural compression of peat material. It has a high carbon content 25 – 35% & a moisture content up to 66%. The high volatile matter content makes it easier to convert into gas and liquid petroleum products than higher ranking coals. Unfortunately its high moisture content and susceptibility to spontaneous combustion can cause problems in transportation and storage. It is used almost exclusively for the generation of electricity in countries such as Greece & China. Germanium is extracted from lignite mined in China. This example is from Miocene deposits in Germany. Specimens are supplied in labelled card trays.
Weight | 120 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3" |
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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.
Lignite thin section slide. Lignite coal and indeed all other varieties of coal are classed as organic sedimentary rocks. It has a high carbon content 25 – 35% & a moisture content up to 66%. The high volatile component of lignite is clearly reflected in the thin section view, particularly when compared with those of higher grade coals.
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Peat (recent) collected on the moorlands of Lancashire. Supplied in a labelled card tray.
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This is a rare & unusual rock, part of the highly studied Zechstein Formation. It is a concretionary Magnesium Limestone of Permian age, supplied in a 1.5″ x 1.5″ magnification box.
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Dolomite or Dolostone is a carbonate rock composed primarily of the mineral Dolomite.
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Pre-Cambrian Torridonian Sandstone from Loch Kishorn, Scotland. Among the oldest rocks to be found in the U.K. Named after the Torridon region of Scotland.
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Rhaetic bone bed, Upper Triassic in age. Rich in marine fossils such as bones, scales & teeth from marine reptiles. From Aust Cliff, Gloucestershire.
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Devonian lower Old Red Desert Sandstone from Gloucestershire available in card trays with a label.
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Banded mudstone, know locally as the Moughton Whetstone from the Silurian deposits Crummackdale, West Yorkshire.
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Oolitic Limestone. Jurassic (Oxfordian) in age from the Malton Oolite & Coral Rag member. Generally much harder than the oolitic example from Gloucestershire. Specimens available in a variety of sizes.
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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.
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A Triassic red millet seed sandstone of aeolian (wind blown) desert origin.
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Tufa rock specimens which are calcium carbonate rich, sponge-like rock with fossil remains. Believed to be from the Quaternary period, particularly, the Flandrian epoch the specimens come from Caerwys, North Wales. Available in various sizes and supplied in a card tray with labels.
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Portland Limestone: a world famous building stone laid down in the Tithonian stage of the Jurassic. Collected from the Isle of Portland, Dorset. Specimens available in a range of sizes.
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Oolitic limestone from the middle Jurassic of Gloucestershire. Traditional building stone throughout the Cotswolds. Available in a range of sizes.
300 in stock
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