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Red marl thin section slide taken from Lower Triassic strata belonging to the Mercia Mudstone Group, formerly known as the Keuper Marls. Marl describes rock which is a calcium carbonate rich i.e. 35% – 65% CaCO3 with the remainder being clay with varying amounts of silt
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Red marl thin section slide taken from Lower Triassic strata belonging to the Mercia Mudstone Group, formerly known as the Keuper Marls. Marl describes rock which is a calcium carbonate rich i.e. 35% – 65% CaCO3 with the remainder being clay with varying amounts of silt. The red marl owes its colour to oxidised iron compounds present in the sediment. This material was deposited in Sahara-like desert conditions when the British Isles was thought to have been about 15 degrees north of the Equator. We collected this particular material around Westbury upon Severn in Gloucestershire, UK. The slides are 30 microns thick and measure 46 x 27 mm in size and have a cover slip of the section along with a protective cardboard sleeve.
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Specimens of Red Marl, collected from Westbury upon Severn in Gloucestershire, UK. Marl is a term that describes an unconsolidated sedimentary rock, that consists of clay and lime. This red marl is part of the Keuper Marls which dates to the early Triassic Mercia Mudstone group. It is a calcium carbonate rich mudstone which forms in Sahara-like desert conditions. The red colouration in these specimens comes from the presence of oxidised iron compounds. Specimens are available in multiple sizes and come in a white card tray with an information label.
We also supply Red Marl thin sections for microscope study which are available to buy HERE.
Chalk thin section microscope slide composed of the debris of calcareous planktonic algae i.e. minute calcite shells known as Coccoliths which detach from micro-organisms known as Coccolithophores. This material is Cretaceous in age and it came from Yorkshire. The glass is 46 x 27 mm in size, supplied in a protective card sleeve with a label, ideal for microscopy, petrology & educational use.
5 in stock
Limestone microscope slide exhibiting numerous calcareous remains of varying fauna held within a calcite cement. The section is made to 30 microns thickness and the glass is 46 x 27 mm in size with a cover slip. Supplied in a protective card sleeve with a label, ideal for microscopy.
9 in stock
Siltstone microscope slide exhibiting the fine to very fine grained nature of this sedimentary rock. The slides often show concentrated bands of mica which punctuate the dominant quartz mass. Excellent to observe the nature of the minerals and distinguish the history of the rock. The glass slide is 46 x 27 mm in size, suitable for enthusiasts, educational use and more, it will come in card sleeve with a label.
Out of stock
Specimens of Tea Green Marl, collected from Gloucestershire, UK. Marl is a term that describes an unconsolidated sedimentary rock, that consists of clay and lime. This Tea Green Marl is part of the Blue Anchor Formation which dates to the Triassic Mercia Mudstone group. This is known as the Keuper Marls. This lithology typically comprises dolomitic silty to porcelanous mudstone. These specimens are shallow marine in origin. These pieces are available in multiple sizes and come in a white card tray with an information label.
50 in stock
Mudstone thin section microscope slide composed of predominantly clay minerals and organic matter with occurrences of silt grade quartz. This material was laid down in a low energy, oxygen starved environment during the Carboniferous Period and it was collected from Lancashire, UK.
7 in stock
Tufa thin section slide. Tufa is a variety of limestone, formed by the precipitation of carbonate minerals from ambient temperature water bodies. This particular material is from the Flandrian epoch of the Quaternary Period and it was collected in Caerwys, North Wales.
5 in stock
Hornfels thin section microscope slide exhibiting a dark colour and a characteristic none crystalline form. Fine grains fit together like the fragments of a mosaic, this is often referred to as rough pavement or pavement structure. Larger quartz clasts are visible but these have recrystallised to form a fine, interlocking mosaic of quartz within the original grain cast.
4 in stock
Hornblende Gneiss thin section slide exhibiting an abundance of the mafic mineral hornblende, accompanied by less abundant biotite mica, quartz and feldspar. This material was collected by staff from Southern Norway. Each section is made to 30 microns thickness and the glass is 46 x 27 mm in size, ideal for microscopy and educational purposes.
2 in stock
Rhomb porphyry thin section exhibiting the textbook porphyritic texture of this rare igneous rock. The thin section shows a fine grained alkali feldspar groundmass with large phenocrysts of augite. This material was collected near Oslo in Norway.
11 in stock
Cordierite Hornfels thin section microscope slide exhibiting a dark colour and a characteristic none crystalline form. Fine grains fit together like the fragments of a mosaic, this is often referred to as rough pavement or pavement structure. Larger crystals of cordierite can be seen scattered throughout the fine matrix.
5 in stock
These thin sections exhibit beautiful crystals of olivine, pyroxene and augite, which often shows oscillatory zonation held within a matrix of plagioclase feldspar. The slides supplement the hand specimens nicely and are useful for interpreting the crystallisation history of the rock.
11 in stock
Rare eclogite thin section slides cut from our Norwegian eclogite hand specimens. Eclogite is a rare rock, composed of mainly two minerals, reddish-brown garnets and Omphacite (green pyroxene), our thin sections exhibit this clearly.
8 in stock
Norwegian gneiss thin section slide exhibiting a dominant felsic composition i.e. quartz and plagioclase with less prominent mafic bands. We collected this material from Evje, Norway. Each section is made to 30 microns thickness and the glass is 46 x 27 mm, ideal for microscopy and educational purposes.
12 in stock
Amygdaloidal basalt thin section slide exhibiting amygdaloids of varying sizes within a fine grained basaltic ground mass. This particular material was collected from the Isle of Skye, Scotland. Each section is made to 30 microns thickness and the glass is 46 x 27 mm in size with a cover slip. Supplied in a protective card sleeve with a label, ideal for microscopy.
5 in stock
Welded tuff thin section slide exhibiting a jumbled mass of irregularly sized broken clasts held in situ by finer ash particles which have become welded together. This material was collected from Cumbria, the original rock is likely rhyolite, and indeed in hand specimen the tuff almost still looks like rhyolite and appears to show a form of banding.
6 in stock
Pumice thin section slide exhibiting the highly vesicular nature of this extrusive igneous rock. Pumice lavas tend to be silicic or felsic which are highly viscous thus do not allow the gas bubbles to escape efficiently.This material was collected from the Lipari islands of Italy.
9 in stock
Stunning peridotite thin section exhibiting the bright and beautiful colours of olivine and pyroxene punctuated by relatively abundant plagioclase. Peridotite is a dense, coarse grained, ultramafic igneous rock consisting largely of olivine and pyroxene.
7 in stock
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