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BANDED MANGANESE ORE (POLISHED SLICE) - Dolgellau, North Wales

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BANDED MANGANESE ORE
cut and polished slice

Cym Mynach Manganese Mine,
Dolgellau, North Wales

 
A very good example of banded manganese ore, recently discovered by mineralogists researching the ancient manganese mines in this beautiful area of Wales, known as the Harlech Dome.  This area is the largest manganese deposit in the UK.


It consists of manganese carbonate and silicate minerals (e.g. rhodochrosite and spessartine). It was originally deposited on the sea floor during the Cambrian period by hot volcanic fluids and laid down as a sedimentary rock. It has since been recrystallised by metamorphism.

This manganese ore is an important horizon in the local Cambrian rocks and the hills are dotted with old manganese mines wherever it occurs.

This slice has been polished on one side, but due to the nature of the rock is doesn't achieve a good polish.

Click on a picture for a larger image


Size:  16 x 13 x 1 centimetres
Weight: 690 grams

 
Optional metal stand (£1)

PRICE: £49.00