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Chistolite slate is a variation of slate which also contains chiastolite crystals within it,the slate its self is either a brick red or plum colour with the chiastolite crystals appearing as white lines and randomly orientated within the rock matrix. rock specimens are available in various sizes and will be supplied in a labelled card tray.
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Chiastolite slate is rock formed by contact metamorphism of carbonaceous shale, characterized by prominent cleavage or schistosity and the presence of conspicuous chiastolite crystals in a fine-grained matrix, the rock, unlike the classic slate is actually quite soft and friable. Chiastolite is a variant of the mineral andalusite and is present in these samples as numerous thin, white lines with random orientation, with their presence indicating peak temperatures. These particular specimens come from Cumbria, UK and are available in various sizes to choose from and will be supplied in a card tray with an information label.
2" x 2", 3" x 2", 4" x 3"
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Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from a shale-type protolith composed of clay or volcanic ash through low-grade regional metamorphism. Supplied in lots of 1 kilos, with an information label.
Phyllite is a foliated metamorphic rock formed from slate which has been further metamorphosed. These specimens from Kinlochleven in Scotland and show good, fine cleavage and a silky metallic lustre.
195 in stock
Dark grey Shale from the Jurassic of the Yorkshire coast. Originally deposited in a deep water marine environment. Occasionally fossiliferous.
199 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
Slate from Wales, famous for its use as a roofing material, these specimens exhibit text book characteristics such as fine grain crystal structure, foliation, slatey cleavage and a variety of colours, excellent for educational use, supplied in various sizes.
78 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
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
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
Metaquartzite is a low grade metamorphic rock often composed mainly of quartz, however, other minerals can exist, and mineral impurities during crystalisation can result in differing colours, these particular samples from Anglesey have a green colouration to them. The rock specimens are available in 3 different sizes and come in a card tray with a data label.
Augen Gneiss is a foliated metamorphic rock with large crystals of lenticular or eliptical shear bound microcline.
13 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
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
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
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
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.
76 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.
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.