In a computer language, a reserved word is a word that cannot be used as an identifier, such as the name of a variable, function, or label â it is reserved from use. This is a syntactic definition, and a reserved word may have no meaning. A closely related and often conflated notion is a keyword, which is a word with special meaning in a particular context. This is a semantic definition. By contrast, names in a standard library but not built into the language are not considered reserved ...
Document status: complete. Citrine is a transparent, yellow macrocrystalline quartz variety. Natural citrine is very rare, in fact almost all the material offered on the market under that name is not natural citrine, but heat treated amethyst.
Since natural citrine is rare, most of the citrine on the market is the result of heat treatment, which causes some amethyst to change color from undesirable pale violet to an attractive yellow. The amethystâs original hue can determine the richness of the resulting citrineâs yellow color.itrine Description. Citrine is one of the most popular yellow gems on the market. This designer cut shows off the warm glow of citrineâs sunny color. â Lydia Dyer, gem courtesy John Dyer & Co. Citrineâthe transparent, pale yellow to brownish orange variety of quartzâis rare in nature.