Cordierite variety Iolite
It is famous for its pleochroism, appearing intense blue in one direction but becoming almost colourless as the stone is turned. Cut stone, faceted girdle, 19.69 ct. Cordierite (Magnesium aluminum silicate)
Picture No
10703781
Media ID
47586965
Size
3071px x 2854px
(4.5MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
Pick your License
Cordierite Cyclosilicate Gemstone Iolite Mineral Pleochroism Silicate Sunstone
Features In These Collections
> Contributors > NHM
