Pronunciation: [ɹˈe͡ɪəfˌe͡ɪn] (IPA) 
Rayophane is a term that relates to a type of glass developed in the 19th century. The pronunciation of Rayophane is /reɪ.oʊ.feɪn/. The first syllable "reɪ" is pronounced as in the word "ray", the second "oʊ" as in "oh", and the third "feɪn" is pronounced as in "fame". The word’s spelling is derived from the Greek word "rayon" meaning beam or ray and "phanein" meaning to show, referring to the way the glass refracts light.
Rayophane is a rare and specialized term used in the field of gemology and mineralogy to describe a specific optical property exhibited by certain gemstones and minerals. Derived from the Greek words "rayo" meaning beam or ray, and "phane" meaning to appear or show, rayophane denotes the lively and mesmerizing display of iridescent rays or flashes of light that emanate from within the stone.
Gemstones and minerals possessing rayophane are characterized by their ability to refract, reflect, and disperse light in such a way that an array of colorful rays is displayed when viewed from different angles. This optical effect is caused by the presence of fine lamellar or fibrous structures within the material, which act as prisms, bending and scattering incoming light to create a striking play of spectral colors.
Rayophane is often observed in gemstones such as moonstones, opals, labradorite, and spectrolite, among others. These stones are valued for their enchanting optical phenomena, as the interplay of light and color adds a captivating element of beauty and uniqueness.
Due to its rare occurrence and aesthetic appeal, rayophane is highly sought after by gemstone collectors, jewelry enthusiasts, and individuals who appreciate the allure of natural optical effects. The term is primarily used within the gemological and mineralogical communities to describe this specific phenomenon that elevates the visual appeal of certain gemstones and minerals, making them truly spectacular and delightfully intriguing.
