 | Percy Gaillemard L. Smith - 1879 - 548 Seiten
...predominating ingredient, felspar. " An average granite may be expected to contain from two to three fifth parts of crystals of quartz or crystalline quartz...(one-tenth part) of mica. But the mica may form two or three tenths, and the quartz threefifths or more, while the proportion of the felspar, as well as the... | |
 | 1892 - 566 Seiten
...predominating ingredient, felspar. " An average granite may be expected to contain from two to three fifth parts of crystals of quartz or crystalline quartz...(one-tenth part) of mica. But the mica may form two or three tenths, and the quartz threefifths or more, -while the proportion of the felspar, as well as... | |
 | 1865 - 564 Seiten
...granites are mixtures of crystalline minerals in various proportions, and an average variety contains from two to three-fifth parts of crystals of quartz or crystalline quartz, alout the same of felspar, and the remainder mica. Granite possesses a mean specific pra vity of 2-66,... | |
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An average granite may be expected to contain from two to three fifth parts of crystals of quartz or crystalline quartz ; about the same, more or less, of felspar, also partly crystalline and chiefly in definite crystals ; and the remainder (one-tenth... 