 | 1850 - 706 Seiten
...crystalline substance, composed of flint, alumina and magnesia, besides a large proportion of the black oxyd of iron. Granites in which hornblende exists are sometimes...having been first found in the island of Syene in Egypt_i' " Syenite (fee thaw's Operative Masonry) is related to granite, and resembles it in its general... | |
 | John Bullock - 1853 - 192 Seiten
...is a dark crystalline substance, composed of flint, alumina, and magnesia, besides a large poportion of the black oxide of iron. Granites in which hornblende exists are sometimes called Syenite, having first been found in the island of Syene in Egypt. 185. Granite is found in mountain-chains, and usually... | |
 | John Bullock - 1855 - 508 Seiten
...is a dark crystalline substance, composed of flint, alumina, and magnesia, besides a large poportion of the black oxide of iron. Granites in which hornblende exists are sometimes called Syenite, having first been found in the island of Syene in Egypt. 185. Granite is found in mountain-chains, and usually... | |
 | John Bullock - 1865 - 506 Seiten
...is a dark crystalline substance, composed of flint, alumina, and magnesia, besides a large poportion of the black oxide of iron. Granites in which hornblende exists are sometimes called Syenite, having first been found in the island of Syene in Egypt. T varieties are exceedingly friable and liable to... | |
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... glittering substance, principally consists of clay and flint, with a little magnesia and oxide of iron. Instead of the mica, another substance called hornblende, is found in some granites ; hornblende is a dark crystalline substance, composed of flint,... 