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 "The Stone Flower", "The Master Craftsman", "A Fragile Twig"); the tales about some mysterious forces, which contain surreal plots and mythical creatures ("The Mistress of the Copper Mountain", "The Malachite Casket", "Sinyushka's Well", "Cat's Ears"); the satirical tales about gold prospectors or greedy bailiffs ("The Manager's Boot-Soles", "Sochen and His Stones"); the tales about mine explorers ("Sinyushka's Well"). During the Great Patriotic War and in the post-war years, Bazhov started writing about Soviet armourers, steel-makers, and teemers, emphasizing the patriotic pride of the Russian workers. He also penned some stories about the Russian communist leaders, Vladimir Lenin and Joseph Stalin.