Iolite Collection

Cordierite-biotite-gneiss
Geological specimen collected by Scotts British Antarctic Expedition 1910-1913, also known as the Terra Nova expedition. It had a broad scientific programme and collected thousands of geological

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 3960

Cordierite
A specimen of cordierite (magnesium aluminum silicate), a mineral from the class of silicates. Its gemstone variety called iolite is popular among gemstone collectors

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

A group of feldspar specimens
Amazonstone crystals and gems, pin set with sunstone, and moonstones. The feldpars are significant rock building minerals

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