perlitic造句

例句与造句

1. Perlitic structure, also common in glasses, consists of the presence of concentric rounded cracks owing to contraction on cooling.
2. Some of these rocks show perlitic or spherulitic structure, and such rocks were probably originally glassy ( obsidians or pitchstones ), but by lapse of time and processes of alteration have slowly passed into very finely crystal-line state.
3. Rutley was the author of an exceedingly useful little book on " Mineralogy " ( 1874; 12th ed ., 1900 ); also of " The Study of Rocks " ( 1879; 2nd ed ., 1881 ), " Rock-forming Minerals " ( 1888 ), and " Granites and Greenstones " ( 1894 ); and of a number of petrographical papers, dealing with perlitic and spherulitic structures, with the rocks of the Malvern Hills, and other related topics.
4. It's difficult to find perlitic in a sentence. 用perlitic造句挺难的