Mineral Examples of such minerals are malachite (green) and azurite (blue). In contrast, allochromatic elements in minerals are present in trace amounts as impurities. An example of such a mineral would be the ruby and sapphire varieties of the mineral corundum. The colours of pseudochromatic minerals are the result of interference of light waves. Examples include labradorite and bornite. In addition to simple body colour, minerals can have various other distinctive optical properties, such as play of colours, asterism, chatoyancy, iridescence, tarnish, and pleochroism. Several of these properties involve variability in colour. Play of colour, such as in opal, results in
Blue Is the Warmest Colour the Warmest Color" through The Criterion Collection on 25 February 2014. As "Blue Is the Warmest Colour", the film was also released on DVD and Blu-ray Disc in Canada on 25 February 2014 by Mongrel Media, in the United Kingdom on 17 March 2014 by Artificial Eye and on 18 June 2014 in Australia by Transmission Films. In Brazil, Blu-ray manufacturing companies Sonopress and Sony DADC are refusing to produce the film because of its content. The distributor is struggling to reverse this situation. "Blue Is the Warmest Colour" grossed a worldwide total of $19,492,879. During its opening in France,