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 to other issues, such as beauty and ugliness, life and death, order and chaos, eroticism, the relationship of people with nature and the Mountain, the mysterious in general, the place of the person in the world. Lidiya Slobozhaninova summarizes that some parts of "The Malachite Box" "become outdated, but others gain new meaning". The stories from the collection inspired numerous adaptations, including films, radio and stage adaptations. The Soviet poet Demyan Bedny was so impressed with the tales that he decided to adapt them into poetry. He began the work on 27 June 1939 and adapted the 14 original stories