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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.
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Biotite gneiss is a variation of the commonly known metamorphic rock, gneiss. Most people will know the rock for being comprised of pink orthoclase feldspar with bands of white quartz and various micas, e.g. muscovite and biotite. Thus resulting in a pink, white and black banding pattern of sorts in the rock. However, these particular specimens contain mainly quartz, plagioclase feldspar (both being white minerals) and biotite mica, which is black. These result is a gneiss which exhibits a black and white banded appearance. The banding, known as foliation are the alternating planar structures of the minerals. The specimens were collected by staff and come from Evje in Norway and come supplied in various optional sizes in a card tray with an information label.
2" x 2", 3" x 2", 4" x 3"
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Hornblende gneiss is a coarse grained metamorphic rock belonging to the gneiss family, its overall dark colouration is due to high levels of the mafic mineral hornblende, while quartz and feldspar are also present. The rock specimens come from southern Norway and are available in various optional sizes.
196 in stock
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.
Gneiss from Evje, Norway, containing more feldspar and quartz than Lewisian gneiss from Scotland, giving it a pink colour, these specimens show excellent banding and text book crystal structure, supplied in 3 sizes, ideal for educational use.
99 in stock
Augen Gneiss is a foliated metamorphic rock with large crystals of lenticular or eliptical shear bound microcline.
13 in stock
Large Pink Gneiss rock specimens collected from Evje, Norway. Specimens also contain some Biotite and show banding. Supplied in 1 kilogram polythene bags with a data label.
Biotite Gneiss rock specimens collected from Evje, Norway. Specimens will show banding. Specimens are supplied in a polythene bag in lots of 1 kg with a label.
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
Dalradian mica schist is a famous metamorphic rock, composed mostly of the minerals muscovite mica with occurrences of quartz and feldspar, these rock specimens are Pre-Cambrian in age and come from Scotland, supplied in a card tray with an information label.
28 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
Garnet Amphibolite supplied in a card tray with a label. This attractive rock from southern Norway has highly prominent garnet porphyroblasts (also known as cherry cake).
23 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.
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
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
Marble with forsterite which has been hydrated to serpentine. Found in Ledmore Quarry, Sutherland. Scottish Highlands. Specimens are supplied in a card tray with a information label.
73 in stock
Gardnos impact breccia are fine examples of a meteorite impact breccia formed approximately 540 million years ago at the Gardnos Crater, Nesbyen, Hallingdal, Norway. Specimens are supplied in a card tray and come with an information label.
Out of stock
Mylonite exhibiting ribbon texture from Lom, central Norway, excellent rock specimens and rare to come by, available in various sizes.
64 in stock
Glaucophane Schist is also known as Blueschist. The blue-green colour comes from the dominant presence of the minerals Glaucophane (amphibole) & Lawsonite (related to epidote). These specimens were collected from the Isle of Anglesey, North Wales.
54 in stock
Hand samples of serpentine bearing conglomeritic clasts (rounded pebbles). The samples were collected from the Lalm-Sel area in the Caledonides of central Norway and are supplied in card trays with a name label.
Out of stock