£3.68 – £10.35 ex VAT
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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Migmatite, also known as diatexite is a rock that is a mixture of both metamorphic and igneous lithologies. Migmatites form under extreme temperature conditions during prograde metamorphism, where partial melting occurs in pre-existing rocks. They are not crystallized from a totally molten material, and are not generally the result of solid-state reactions. Commonly, these rocks occur within extremely deformed rocks that represent the base of eroded mountain chains, typically within Precambrian cratonic blocks. Migmatites often appear as tightly, incoherently folded (ptygmatic folds) dikelets. The samples were collected by our staff in central Norway. Each specimen is supplied in a labelled card tray.
2" x 2", 3" x 2", 4" x 3"
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Mylonite exhibiting ribbon texture from Lom, central Norway, excellent rock specimens and rare to come by, available in various sizes.
64 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
Garnet mica schist from Loch Tay, Scotland, showing in excellent detail the effects of regional metamorphism along plate boundaries, the garnets push the mica crystals around it due to being stronger, the specimens are available in various sizes or as a cut and lacquered piece, supplied in a card tray with a data label.
59 in stock
Eclogite is an uncommon metamorphic rock, composed of mainly two minerals, reddish-brown garnets and omphacite, a green pyroxene. Other minerals, such as blue kyanite and white quartz may also be present. Over all, it is an attractive looking yet rare rock, with a vibrant green colouration with red garnets to break it up. These rocks come from Almenning, Norway. Specimens are supplied in card trays with labels and come available in 4 sizes.
Lewisian gneiss from Northwest Scotland, formed during the Pre-Cambrian period, making it among the oldest rocks in the UK, pushed to the surface during an oregenic event, Lewisian gneiss exhibits banded like most gneisses but is comprised of more dark, dense minerals, often igneous in origin. Specimens are available in 3 different sizes.
Eclogite is a rare metamorphic rock, these specimens come from Scotland and exhibit the two major minerals expected, red garnets and green omphacite. However, both minerals appear to be much darker in colour when compared to Norwegian material. Our stock of this is fairly low now, and only smaller size pieces are available, they will come supplied in a card tray with a data label.
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.
44 in stock
Banded hornfels exhibiting an alternating band feature, likely due to the original rock being layered such as sandstone, shale etc. The specimens come from Kentellen, Scotland, are available in different sizes and come in a card tray, suitable for school use.
10 in stock
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
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.
32 in stock
Augen Gneiss is a foliated metamorphic rock with large crystals of lenticular or eliptical shear bound microcline.
13 in 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
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