Iridescence

Definition and stakes

Adela E. Orpen,  Stories About Famous Precious Stones

“ But after the touch of the magic wheel there is no substance which can compare with the diamond for luster, brilliancy and iridescence.
Certain Indian diamonds finished by the hand of Nature and known as "Naifes," are an exception to the rule that rough diamonds are dull looking. They are seldom or never found now, but were greatly prized by the natives in olden times and considered superior to the artificially polished stone. They were octahedral in form, with polished facets. The primary crystalline form of the diamond is the octahedron, or a figure of eight sides
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Source: Gutenberg

A. H. Cooke,  The Cambridge natural history, Vol… (1895)

“ The tenacious character of the mud on the ocean floor must make rapid motion very difficult. The shell itself is usually fragile and delicate, the upper layers of arragonite being thin as compared with shallow-water species, which makes the nacreous layer, when present, appear unusually conspicuous; in many cases the surface is characterised by a peculiar iridescence or sheen. The colour in the shell of deep-sea Mollusca is never very pronounced, and is often absent altogether. ”
Source: Gutenberg

Portrait of Will Irwin Will Irwin,  The Third Circle

“ His hands were huge and white, and lay open and palm upward at his side, the fingers inertly lax, like those of a discarded glove, and his face——
When I looked at the face of him I know not what insane desire, born of an unconquerable disgust, came up in me to rush upon him and club him down to the pavement with my stick and batter in that face—that face of a blind idiot—and blot it out from the sight of the sun for good and all. It was impossible to feel pity for the wretch.
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Source: Gutenberg

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