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Biotite granite igneous rock specimens from Ballachulish, Scotland, UK. Composed of the felsic minerals quartz and feldspar, with occurrences of biotite crystals. The rock has an overall white appearance due to its felsic chemistry but the black biotite mica offers a striking contrast in colours. The samples are ideal for both collectors due to the attractive nature and for college to university level education to describe the variations in granite which one may find. The samples are available in three sizes and supplied in a card tray with an information label.
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Biotite granite is a coarse grained intrusive igneous rock of felsic chemistry, as the name and chemistry suggests, this variant of granite is composed mainly of the minerals quartz, feldspar with biotite mica. The quartz present in the rock is a white colour due to the presence of fluids as gas inclusions during the time the rock formed. Plagioclase feldspar, a sodium mineral, which is typically white in colour because of the presence of albite or anorthite give the rock an overall white or very pale grey colouration. However, the presence of biotite mica crystals within the rock give it a striking appearance due to the complete contrast in opposite colours making this rock not only sought after by collectors but also often used in various masonary, decorative and building use due to it’s attractive appearance. This rock comes from Ballachulish, Scotland in the UK and is an excellent rock for educational use to describe the variations of granite which can be found. The samples are available in three sizes and come supplied in a card tray with a label.
Weight | 130 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3", Thin Section Slide |
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Coarse grained variation of granite, composed of quartz, feldspar, biotite and muscovite. These samples were collected from Liskeard, Cornwall and are ideal for educational use.
Biotite granite thin section exhibiting abundant biotite crystals within a typical granite crystal mass. These thin sections supplement the hand specimens nicely and allow the crystallisation history of the rock to be interpreted.
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.
6 in stock
Specimens of Basalt, collected from Northern Ireland. Basalt is a common, extrusive igneous rock, that forms when magma erupts and cools quickly on the Earth’s surface. These specimens are part of the Antrim lava group and date to the Tertiary period, around 60 million years ago. This is the same as the Basalt that makes up the famous Giant’s Causeway. The chemistry of these specimens suggests that the rock is olivine basalt, and comprises plagioclase feldspar, olivine and augite. These specimens are available in multiple sizes and come in a white card tray with an information label.
We also supply Basalt thin sections for microscope study which are available to buy HERE.
10 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.
40 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
Rhyolite Felsite, a highly felsitic composed variation of Rhyolite, found in Fife, Scotland, an extrusive igneous rock composed of sodium, quartz and feldspar, thus often having a pale white to pink colouration. Available in various sizes and supplied in a card tray with an information label.
32 in stock
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.
170 in stock
Specimens of Flint, collected from South Devon in the UK. Flint, a variety of Chert, is a micro crystalline, sedimentary rock. It is part of the silicate family and has a conchoidal fracture. These specimens display a monochromatic black interior, offset by a distinct white exterior. These specimens are available in various sizes and come in a white card tray with an information label.
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.
Amygdaloidal basalt is an igneous rock which is extrusive in nature, these specimens formed over 60 million years ago during the Tertiary period and come from Ireland. They are part of the Antrim lava group and exhibit a dark colouration with occurrences of amygdales containing quartz and calcite crystals. As a basalt they are somewhat dense, but lighter than pure samples due to the cavities within them which formed as a result of gaseous activity during their ejection. Over time, hydrothermal fluids pass through the rock and minerals form within the cavities, which gives the usually dark coloured rock a speckled appearance. These samples are available in various sizes and are suitable for higher educational use to detail the subtle differences between similar igneous rocks, they come supplied in a card tray with an information label.
59 in stock
An off white coloured streak plate made form porcelain, they are used by field geologists and students as a means of performing streak tests on minerals. This test simply involves one, scratching the surface of the tile with a particular rock or mineral, the coloured streak left behind then assists the user in determining the mineral, or minerals within a rock sample.
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
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.
The metamorphic rock texture card is made for earth science students, it displays numerous bites of information on how to determine an metamorphic rock specimen found in the field via their 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.
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.
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