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Biotite Gneiss – Norway

Augen Gneiss

£1.15 – £3.46 ex VAT

Hornfels (Banded)

£1.65 – £3.45 ex VAT

£1.38 – £3.46 ex VAT

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.

Weight 130 g
Specimen Size

2" x 2", 3" x 2", 4" x 3"

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