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 Box Stone" () inspired by "Yermak's Swans". In 2006 "Sinyushka's Well" was adapted into the musical for Russian folk instruments orchestra by Svetlana Nesterova. A docufiction feature film "Tales of the Ural Mountains" (), released by Sverdlovsk Film Studio in 1968, combined information about Bazhov's works with acted scenes from "The Mistress of the Copper Mountain", "The Stone Flower", "The Master Craftsman", "The Fire-Fairy", "The Twisted Roll", "That Spark of Life". The animated film series based on the stories from "The Malachite Box" was made at Sverdlovsk Film Studio from the early 1970s to early 1980s, on time for the 100th