網頁Chatoyancy, or “cat's eye,” is an optical phenomenon caused by light reflecting off a gemstone with internal fibrous minerals or inclusions arranged in parallel direction. When these gemstones are cut in specific directions, the reflected light display a pattern that is perpendicular to the fibrous streaks, which is similar to that a cat's eye. Chatoyancy in wood occurs in various species – particularly hardwoods and the various types of Nanmu woods of China and South East Asia, particularly where stresses from the weight of the growing tree result in denser patches, or where stresses cause burl or bird’s eye. This ‘figure’, which has a … 查看更多內容 In gemology, chatoyancy , or chatoyance or cat's eye effect, is an optical reflectance effect seen in certain gemstones, woods, and carbon fibre. Coined from the French œil de chat, meaning 'cat's eye', chatoyancy … 查看更多內容 • Asterism (gemology) – ornamental stones that exhibit a luminous star when cut en cabochon • Optical phenomena – Observable events that result from the interaction of … 查看更多內容 The precipitates that cause chatoyance in chrysoberyl are the mineral rutile, composed mostly of titanium dioxide. Examined samples have yielded no evidence of tubes or fibres. The rutile precipitates all align perpendicularly with respect to cat's … 查看更多內容
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網頁Chatoyancy is a unique quality in some woods that allows the wood grain to reflect light similar to certain gemstones. When rotating and changing the angle ... 網頁chatoyance, the property of some minerals to exhibit a wavy, luminous band with a silky lustre, reminiscent of the eye of a cat, in the centre of a cabochon-cut (polished, with a … cgt business relief
Chatoyancy Definition & Meaning - Merriam-Webster
網頁Quartz cat’s-eye, the commonest, owes its chatoyancy and grayish green or greenish colour to parallel fibres of asbestos in the quartz. The two may be distinguished by their specific gravities; chrysoberyl is much denser. Crocidolite cat’s-eye (African cat’s-eye), more commonly known as tigereye (or tiger’s-eye), is quartz that contains ... 網頁Chatoyancy is often observed in gemstones such as chrysoberyl, tourmaline and moonstone; however, it is rarely observed in sapphires. 1,2 The research on the chatoyancy of sapphires is relatively rare; thus, it is necessary to investigate it innovatively. 網頁2024年2月1日 · The hue of this stone changed from greenish yellow under daylight or fluorescent light to pinkish brown under incandescent light. Diaspore’s color change can be caused by the chromophores Cr 3+, V 3+, and Fe 2+ –Ti 4+ pairs (C. Shen and R. Lu, “The color origin of gem diaspore: Correlation to corundum,” Winter 2024 G&G, pp. 394–403 ). cgt business meaning