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PRODUCTS BY WEIGHT
BOX SETS
PLASTIC DISPLAY PRODUCTS
PRODUCTS BY WEIGHT
BOX SETS
PLASTIC DISPLAY PRODUCTS
£9.00 ex VAT
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.
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Bituminous coal is an organic sedimentary rock formed by diagenetic and sub metamorphic compression of peat bog & swamp material. Its primary constituents are macerals: vitrinite, and liptinite. The carbon content of bituminous coal is around 60-80%; the rest is composed of residual water, air, hydrogen, and sulphur. It is graded according to its vitrinite reflectance, volatiles content, plasticity & ash content which in turn gave rise to specific uses e.g. smithing, coking or just general heating fuel. These particular examples are from the Carboniferous deposits in Lancashire. the samples are supplied by weight and come in a kilo bag with a label.
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Anthracite coal specimens, a vitreous, high grade coal with a hard and compact nature, these samples are from the Carboniferous coalfields of South Wales, UK and are one of the coals which have fewer impurities and a high carbon contents. Available in optional sizes, each sample will come supplied in a card tray with a label.
198 in stock
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. Although historically the term cannel coal has been used interchangeably.
200 in stock
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.
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.
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.
91 in stock
Pumice specimens from the Lipari islands, Italy. Pumice is an igneous rock with a highly porous structure resulting from trapped gas bubbles as the lava was being ejected. The rock is usually very light & buoyant in water. Specimens are supplied in a card tray with label.
57 in stock
Rhyolite Felsite, a highly felsitic composed variation of Rhyolite, found in Scotland. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Obsidian is an extrusive igneous rock, these specimens exhibit a typical black colouration with conchoidal fractures, they come from South East Mexico and are excellent for educational use and collectors due to the quality. This igneous rock forms when magma extrudes onto the earths surface, chemically it is silica rich and impurities give the black colouration. It’s fine crystalline texture and fracture makes obsidian appear glassy and it breaks as such. The pieces are available in various sizes and come supplied in a card tray with an information label.
Syenite thin section slide. The thin sections show a dominant feldspar mass ( orthoclase ) with occurrences of hornblende, amphibole and clinopyroxene. Biotite mica may also be present however its occurrence is rare, The thin section is supplied in a protective card sleeve with a label, ideal for microscopy and educational purposes.
Click here to to explore our extensive collection of igneous, sedimentary, metamorphic, and mineral thin sections. We offer a wide range of options to cater to your needs. If you require a microscope, you can find them available here as well.
5 in stock
This Mahogany obsidian is sourced in the United States of America. Impurities of magnesium and iron give this variety a red or brown appearance hence the name ‘mahogany obsidian’ or oak obsidian. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Out of stock
Granite adamellite thin section slide exhibiting crystals of quartz, biotite and feldspar. We collected this material from the famous Shap Fell quarry, in Cumbria hence the rocks alternative name ‘ Shap Granite ‘.
We provide a full range of igneous, sedimentary, metamorphic and mineral thin sections. Click here to view them. Should you require a microscope, they can be found here.
8 in stock
Graphic Granite is a leucocratic igneous rock found predominantly in granitic pegmatites. It’s coarse intergrowths of feldspars display a Runic or Cuneiform configuration hence the term “graphic”
100 in stock
Graphic granite is an igneous pegmatite rock from Iveland, Norway, which forms in intrusive batholithic bodies that have a felsic composition. As such, the rock is mainly composed of quartz and orthoclase feldspar crystals and lacks any mica, making the rock leucocratic. These samples have what is known as a graphic texture, due to the formation of the crystals, which result in an appearance similar to that of cuneiform text which was once used by ancient human cultures. A brightly coloured, eye catching rock, the samples are suitable for collectors and educational use at higher levels and come available in three sizes. Each specimens is supplied in a card tray with an information label.
93 in stock
Metagabbro specimens from Lom, Central Norway. Also known as scapolite-hornblende due to the absence of feldspar in the rock are available in 3 optional sizes and come supplied in a card tray with a data label.
42 in stock
Obsidian is a naturally occurring volcanic glass derived from a rapidly cooled high silica lava. Often associated with the margins of Rhyolitic lava flows. It has little or no discernable crystalline structure. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
Accretionary lapilli tuff is an igneous pyroclastic rock, these samples come from Longsleddle, Cumbria in the UK and forms when hot ash and debris is ejected from as volcano. Some of this material is held together by moisture and once heavy enough, falls into the ash below forming small ‘spots’ within the material, creating a speckled rock. The samples are suitable both for young and serious collectors as well as educational use and are supplied in various sizes with a card tray and label.
65 in stock
Banded rhyolite from Glen Coe, Scotland showing laminar flow banding which was produced by the viscous lava which formed the rock, available in various sizes, these specimens are suitable for educational use to display flow banding. Supplied in a card tray with an information label.
72 in stock
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