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Tanzanite crystal and cut stoneThis is a blue variety of the mineral zoisite. Strongly pleochroic, it displays rich blue, magenta and yellowish-grey colours when viewed from different angles
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
Kunzite crystal and cut stoneStrongly dichroic pink kunzite crystal and faceted kunzite. Kunzite (lithium aluminum silicate) is the pink variety of spodumene and is pleochroic
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
Andalusite cut stoneAndalusite is an aluminium silicate. It shows spectacular red and green pleochroic colours