£1.44 – £3.85 ex VAT
Greisen metamorphic rock specimens from Caldbeck Fells, Cumbria, composed mainly of quartz and mica with an off yellow colouration. The rock is known as an endoskarn and forms when hydrothermal fluid and heat alter a granitic body, resulting a heavily altered rock which may contain trace amounts of rare elements. These samples are suitable for advanced collectors and higher level education and are available in three sizes, each pieces will come supplied in a card tray with a label.
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Greisen are metamorphic rocks formed by hydrothermal alteration of felsic igneous rocks such as granites or pegmatites. As such, they are mostly composed of micas and quartz mienerals but little to no feldspar and can be more clearly defined as an endoskarn. This process occurs when a granitic pluton releases heat and hydrothermal fluids as a later stage which results in a process known as greisenisation, altering the pre-existing granite already in place. Essentially, the granitic intrusion metamorphosed its self. The rock its self has a coarse grained texture with crystals being easily visible with the naked eye, similar to granites naturally, however, they tend to have an overall yellow colouration due to processes that led to the formation which leave the rock not very attractive to look at. But the unique process in which greisen forms does result in rare elements crystallising within the endoskarn which are often of high economic value, these include fluorites, wolframite, cassiterite, lepidolite mica and many more, thus making greisen bodies an excellent source of rare metals in the past and as an indicator to potential ore deposits in a particular area. These particular samples come from the Caldbeck Fells in Cumbria and are ideal for advanced collectors or those interest in rare metals and their associated rock formations, as well as higher level education to describe altered bodies of rock and the potential to find ore deposits in the area. The specimens are available in three sizes and come supplied in a card tray with an information label.
2" x 2", 3" x 2", 4" x 3"
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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.
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Migmatites are an unusual rock that is a mixture of both igneous & metamorphic lithologies.The samples were collected by our staff and come from central Norway. Each specimen comes in a card tray with a label.
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White marble exhibiting medium interlocking crystals suggesting a limestone rock origin These particular specimens are from Torrin Quarry on the Isle of Skye, Scotland and are available in three optional sizes.
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This variation of Hornfels exhibits strong banding with small crystals of Cordierite.The samples were collected from near Carrock Fell. Cumbria, UK. .
38 in stock
Metaquartzite collected from Onich near Ballachulish, Scotland, which detail text book quality metaquartzite, pure white, hard and composed mainly of quartz with very few impurities, these rock specimens are ideal for educational use or as part of a larger collection of rocks, supplied in a card tray with a label.
Serpentine is a green coloured schist rock, most famous from its type locality along the Lizard peninsula, Cornwall. These specimens come from the Isle of Anglesey, have a much more vibrant colour and are available in various sizes.
Out of stock
Hornfels, dark blue or black in colour collected from Shap quarry, Cumbria, a strong, durable rock, splintery when broken is comprised of mafic minerals, the rock may also exhibit acoustic properties. Supplied in a sized up card tray with an information label.
34 in stock
Specimens of serpentine found in Modum, Southern Norway. Specimens are supplied in a card tray with a information label.
A rare, green marble dating back some 700 million years to the end of the Pre-Cambrian. This marble comes from the Streamstown quarry in Clifden, Co. Galway. Specimens ( max size 3″ x 2″) are supplied in a labelled card tray.
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Samples of graphitic schist from the Pre-Cambrian Dalradian formation, making them among the oldest rocks in the country. The samples come from the Ben Eagach schist formation at Foss mine, Scotland, UK and were collected by our own members of staff. The rock contains mica and graphite, which gives the specimens their unique mica appearance and greasy graphitic texture and lustre.
74 in stock
Biotite gneiss is a metamorphic rock found in Evje, Norway. These specimens exhibit alternating bands of black and white minerals, derived from quartz, plagioclase feldspar and biotite mica. Giving a surreal appearance, similar to the stripes of a zebra. The samples are available in various sizes and comes supplied in a card tray with a label.
75 in stock
Augen Gneiss is a foliated metamorphic rock with large crystals of lenticular or eliptical shear bound microcline.
13 in stock