a. The general arrangement of crystals in a solid metal (for example, an ingot) as seen by the naked eye or at low magnification. The term is also applied to the general distribution of impurities in a mass of metal as seen by the naked eye after certain methods of etching. CTD b. The structure of metals as revealed by examination of the etched surface of a polished specimen at a magnification not exceeding 10 diameters. ASM, 1 c. A structural feature of a rock that is discernible to the unaided eye, or with the help of a simple magnifier. Fay d. The arrangement of crystals in a metal or in a rock that, with or without etching or other chemical treatment, is discernible to the unaided eye or with the help of a simple magnifier (generally less than 10X).
Source: Dictionary of Mining, Mineral, and Related Terms












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