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Chert is classified as a sedimentary rock and is a hard cryptocrystalline form of silica. It is found as nodules and bands within the Cretaceous Chalk, with these samples coming from Norfolk in the UK. It is well known for its glassy crystalline texture which allows pieces to be knapped and for this, the rock was used by stone age humans to make various cutting tools and weapons as it often break, leaving sharp edges. The specimens exhibit an earthy brown colour with a waxy lustre and are available in various sizes, which will come supplied in a card tray with an information label.
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Chert is a hard, cryptocrystalline silica rock of sedimentary origin. It is often to be found as nodules and irregular masses within sedimentary rocks. It is specifically associated with chalk and marl type limestones and it is believed to have formed as a result of large numbers of echinoderms and sea sponges, the bodies of which were highly siliceous, resulting in the chert forming, which chemically is composed of silica . They can be found in variety of colours from dark grey-black, brown, green through to yellow and white. When found in a black colouration, the rock is often instead referred to as ‘flint’. These specimens are however, an earthy brown to yellow colour and show a waxy lustre, often with a white, rough textured outer layer which is usually a layer of chalk. Our examples are from the Cretaceous Chalk beds of Norfolk and are available in three sizes, of which will come supplied in a card tray with an information label.
Weight | 120 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3" |
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Specimens of chert found in Foss mine, Scotland, UK. Specimens are supplied in a white card tray with an information label.
15 in stock
Chert, a hard cryptocrystalline silica found as nodules & bands within the Cretaceous Chalk. Supplied by weight in 1 kilo bags.
25 in stock
Puddingstone conglomerate is a rare sedimentary rock from Hertfordshire, UK which formed during the Paleocene to Eocene period. Composed of rounded flint clasts within a silica matrix, this rock is quite hard and breaks with conchoidal fractures. Formed through erosion of flint pebbles which were later cemented by sand and silica, it is an excellent representation of conglomerate, detailing rounded clasts within a matrix. The specimens are available in 4 sizes and come supplied in a card tray with a label.
298 in stock
Devonian lower Old Red Desert Sandstone from Gloucestershire available in card trays with a label.
198 in stock
Lower Carboniferous crinoidal limestone from Derbyshire, U.K.
297 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, and come supplied in a white card tray with an information label.
60 in stock
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. Available in card trays with labels.
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. Specimens available in a variety of sizes.
Out of stock
Oolitic limestone from the middle Jurassic of Gloucestershire. Traditional building stone throughout the Cotswolds. Available in a range of sizes.
300 in stock
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
A fine grained sandstone formed in estuarine (river mouth) conditions, composed of fine quartz and mica.
Specimens of fault breccia found in Great Langdale, Cumbria, UK. These specimens are fault breccia meaning that unlike other breccia they were formed by tectonic forces. Specimens are supplied in a white card tray with a information label.
Out of stock
Dark grey Graptolitic Shale from Scotland or Cumbria. Contains the delicate blade-like fossils of Graptolites. These were small, colonial marine creatures. Please note that the graptolite content of these specimens is variable.
20 in stock
Shelly limestone containing numerous fossil of Carboniferous age, including bivalves , corals, crinoids & brachiopods. These specimens were collected in Gloucestershire, Uk. They are available in a variety of sizes.
Out of stock
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.
98 in stock
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