Pleochroism in an iolite cut stone
This iolite (magnesium aluminium silicate) is displaying pleochroism, a varied colour effect as the gem is turned. See also 003959
Picture No
10705051
Media ID
47572058
Size
3543px x 2818px
(3.2MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
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Aluminium Aluminum Cordierite Corundum Cyclosilicate Gemstone Hematite Iolite Magnesium Mineral Oxide Pleochroism Sapphire Silicate Sunstone Varied
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