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Biotite muscovite granite specimens from St. Austell in Cornwall, UK of Permian age is a coarse grained igneous rock composed of quartz, plagioclase feldspar, biotite and muscovite. The rock is part of the St. Austell pluton which formed 280 million years ago. An off white colour with gold and black flecks of micas, the rock has a unique chemistry and resulted in the rich mineralisation of ores in the area. The samples are suitable for collectors and educational use to show granite variants, available in three sizes. Each piece will come supplied in a card tray with an information label.
We also supply Biotite Muscovite Granite thin sections for microscope study which are available to buy HERE.
We ship to all 50 states, Washington DC.
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Always free shipping for orders over US $200.
During sale periods and promotions the delivery time may be longer than normal.
Elessi will accept exchanges and returns of unworn and unwashed garments within 30 days of the date of purchase (14 days during the sales period), on presentation of the original till receipt at any store where the corresponding collection is available within the country of purchase.
Your return will usually be processed within a week to a week and a half. We’ll send you a Return Notification email to notify you once the return has been completed.
Please allow 1-3 business days for refunds to be received to the original form of payment once the return has been processed.
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Email: contact@mydomain.com
Phone: +1 (23) 456 789
Biotite muscovite granite is coarse grained rock and another variation of granite which is felsic in chemistry, meaning that its main constituent minerals are quartz and feldspar. The quartz has a white colouration which is down to the presence of fluid gases present during the formation of the rock which stop the quartz forming clear. Plagioclase, a potasium mineral being white in general due to either being albite or anorthite gives the rock an overall off white tone in colour. However, this rock also contains numerous biotite and muscovite mica crystals which both contrast in colour from one another due to differing chemistries. Muscovite, like all micas form in sheets and is often colourless when the sheets are single, however, when overlaid can give a bronze or brassy appearance with a hint of green. Biotite mica on the other hand, while almost identical in chemistry, also contains higher amount of iron (Fe), thus, the mineral appears black. All of these minerals together comprise of this rock which is better known as ‘Cornish Granite’. The granite however is part of the Cornubian batholith, specifically the St. Austell pluton, an igneous granitic body which formed during the Permian period around 280 million years ago and was the driving force behind various intrusions of heat and fluid infiltrating the local rock already in the area which resulted in mineralisation and later leading to rich ore deposits. The feldspar from exposed occurrences of this granite and others in the area eventually led to the formation of kalonite which would later be used to produce china clay. An excellent rock specimen for serious collectors as well as college or university level education, these particular rock samples can be used to both describe the variations that one may find in granites as well as show the chemistry of the rock and how such an igneous body can alter it’s surroundings and result in mineral ores being deposited. These samples come from St. Austell in Cornwall, UK and are available in three sizes and come supplied in a card tray with an information label.
We also supply Biotite Muscovite Granite thin sections for microscope study which are available to buy HERE.
Weight | 130 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3" |
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Granodiorite specimens from Cumbria, UK. These rocks originate from the Ordovician era, dating back roughly 443 to 448 million years. This Granodiorite, derived from Eskdale granite outcrops, exhibit a coarse-grained texture and represents a blend of granite and diorite characteristics.. While sharing mineral components like quartz, feldspar, and mica with granites, its distinctiveness lies in the elevated levels of plagioclase and mafic minerals like biotite, hornblende, and augite. Notably, this specific Granodiorite variety boasts a significant biotite content. Available in three different sizes, these specimens come supplied in a white card tray with information label.
We also supply Granodiorite thin sections for microscope study which are available to buy HERE.
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
Ignimbirte welded tuff is a pyroclastic rock of any origin formed through volcanic processes, the rock appears to show streaks of welded material on some surfaces and appears to be rhyolitic on the inside. Specimens come from Cumbria and are available in various sizes.
We also supply Welded Tuff thin sections for microscope study which are available to buy HERE.
73 in stock
Specimens of clear quartz crystal beds within basalt from Barras, Kincardineshire, Scotland. Pieces are supplied in a card tray with an information label. These are ideal samples for collectors of British minerals and rocks.
Out of 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.
40 in stock
Brockram Breccia specimens sourced from Hoff, Cumbria, UK. Breccia, a type of clastic sedimentary rock, is characterized by its coarse-grained and poorly sorted nature, containing large angular fragments embedded in a finer-grained matrix.
Brockram is a basal breccia, composed of cemented limestone and sandstone fragments originating from the Permian period. The Permian was the last period of the Paleozoic era and occurred approximately 299 – 251 million years ago.
These samples are available in various sizes and are presented in a white card tray along with accompanying information label.
Garnet peridotite igneous rock specimens found in the Gusdal Olivine Pit, Åheim, Norway is an ultra mafic rock which contains high pressure and temperature minerals such as olivine and garnet crystals. Exhibiting a green colouraiton with striking red spots, these samples were pushed up to the earths crust during the Caledonian orogeny during the Ordovician and Devonian period over 400 million years ago. The specimens are dense as expected and are ideal for children and serious collectors because of the colourful appearance as well as for higher educational use to describe deep mantle material as well as orogenic processes. The hand samples are available in various sizes and come supplied in a card tray with an information label.
We also supply Garnet Peridotite thin sections for microscope study which are available to buy HERE.
169 in stock
German Eclogite specimens from Weissenstein, Bavaria. Eclogite is a metamorphic rock, featuring red garnets within a matrix of sodium rich plagioclase called omphacite. These samples are perfect for both collectors and for educational use. They come supplied in a white card tray with an information label. Limited stock available.
A field guide containing various pages which are based on the munsell colour system to aid in the identification of rocks whilst working in the field.
Out of stock
The Estwing E3-20BLC is a 20 ounce (566 gram) geological hammer with a chisel edge head to cut, split or pry rocks or a flat face to break or crush material. The hammer is made from drop forged American steel with an anti-shock vinyl grip. An excellent hammer and the best in the industry, the Estwing E3-20BLC is the bench mark for geological hammers.
Technical Specification:
13 in stock
Rock specimen sample cards, these cards are blank having spaces for you to write the ‘name’, ‘age/horizon’ and ‘locality’ of a rock specimen or specimens collected. Ideal for conducting field work or cataloging your collection. 73mm x 46mm.
1936 in stock
The igneous rock texture card is made for earth science students, it displays numerous bites of information on how to determine an igneous specimen found in the field such as grain size, silica and mineral content and other observable features. The cards have been laminated, making them waterproof, small, the size of a bank card and an excellent to hand guide for students, amateurs and professionals.
129 in stock
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