The Malachite Casket (fairy tale) Malachite Casket: Tales from the Urals" collection. In the 1950s another translation of "The Malachite Casket" was made by Eve Manning The talented miner Stepan dies, leaving his widow Nastasya (Nastyona) and their two sons and a daughter. Nastasya becomes the owner of the Malachite Casket filled with jewellery, which Stepan got from the legendary Mistress of the Copper Mountain. Only Tanyushka likes to play with the Casket, and every piece of jewellery looks good on her. With black hair and green eyes, Tanyushka does not look like her mother at all, as if she was born to different parents.
Mineral the sample reflecting different colours as it is turned, while pleochroism describes the change in colour as light passes through a mineral in a different orientation. Iridescence is a variety of the play of colours where light scatters off a coating on the surface of crystal, cleavage planes, or off layers having minor gradations in chemistry. In contrast, the play of colours in opal is caused by light refracting from ordered microscopic silica spheres within its physical structure. Chatoyancy ("cat's eye") is the wavy banding of colour that is observed as the sample is rotated; asterism, a variety of chatoyancy,