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Cordierite-biotite-gneissGeological 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 stoneThis iolite (magnesium aluminium silicate) is displaying pleochroism, a varied colour effect as the gem is turned. See also 3960
CordieriteA 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 IoliteIt 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 specimensAmazonstone crystals and gems, pin set with sunstone, and moonstones. The feldpars are significant rock building minerals