Cordierite
Cordierite (magnesium aluminum silicate) is also known as Sunstone and was used by the Vikings as a navigation aid. This mineral appears to change colour when it's turned around
Picture No
10711280
Media ID
47586284
Size
4212px x 4146px
(8.5MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
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Aluminium Aluminum Cordierite Cyclosilicate Iolite Magnesium Mineral Pleochroism Silicate Sunstone Viking
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