Lake Superior Agate #2
by Natural History Museum, London/science Photo Library
Title
Lake Superior Agate #2
Artist
Natural History Museum, London/science Photo Library
Medium
Photograph - Photograph
Description
Unweathered Lake Superior agate. Agate is an aggregate of different forms of silica (SiO2) that have formed concentric bands within a geode. A geode forms when the silica precipitates from liquid onto the inside surface of an empty pocket in a host rock. The outer layers are variegated forms of chalcedony (amorphous or non-crystalline silica), with the layers becoming more crystalline towards the centre. These agates are stained by iron and found on the shores of Lake Superior, USA. Specimen from a mine in the Keweenaw Peninsula, Michigan, USA.
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September 30th, 2018
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