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
The Malachite Casket (fairy tale) Her appearance resembles that of the Mistress of the Copper Mountain. A female vagabond comes to their house and stays for a while, teaching Tanyushka silk embroidering. Nastasya is not happy with the arrangement, because she feels that Tanyushka "doesn't want to come to her own mother, but hugs a tramp". Nevertheless they become very close. One day, when the woman is alone with Tanyushka, the girl shows her the jewellery from the Malachite Casket, and in return the woman shows her a vision of a beautiful room decorated with malachite. She explains that the Malachite Room of the Tsar's