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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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