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) The Malachite Casket (fairy tale) "The Malachite Casket" (), also known as "The Malachite Box", is a folk tale (the so-called "skaz") of the Ural region collected and reworked by Pavel Bazhov. It was first published in the several issues of the Sverdlovsk newspaper "Na Smenu!" in September—November 1938, and in "Uralsky Sovremennik" (volume 1, 1938). It was later released as a part of "The Malachite Casket" collection. "The Malachite Casket" is considered to be one of the best stories in the collection. The story was translated from Russian into English by Alan Moray Williams in 1944, and by Eve