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Uploaded on:
16/03/2009 07:49:46
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P number: P527631
Caption: A manganese ore known as manganite from Oa on Islay,.
Description: A manganese ore called manganite occurs in the network of veins traversing the quartzite cliff in the south of the Oa peninsula on Islay. British Geological Survey Petrology Collection sample number MC 7411. At the base of the cliff called Dun Athad it was worked many years ago and is said to have fetched #4 per ton. Works seem to have been given up due to the difficulty of access. Manganite is a hydrated manganese oxide belonging to the monoclinic crystal system. Its usual form is as elongated prismatic black crystals, semi-opaque with a submetallic lustre and it has a hardness on Moh's scale of hardness of 4.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 306.41 KB; 1000 x 665 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI);
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Categories: Best of BGS Images/ Rocks and minerals  


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