The New Encyclopaedia Britannica, Volume 29Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 39
... rock that consists largely of quartz , andesine , biotite , and horn- blende , with a little interstitial orthoclase . The rock is named for Mt. Tonale , in the Italian Tirol , where it is streaky and inhomogeneous , with clots and ...
... rock that consists largely of quartz , andesine , biotite , and horn- blende , with a little interstitial orthoclase . The rock is named for Mt. Tonale , in the Italian Tirol , where it is streaky and inhomogeneous , with clots and ...
Page 473
... rock ; for example , obsidian , scoria , pumice , perlite , ash , and Pele's hair re- fer to distinctive rocks with a vitreous texture . Vitreous texture usually forms in rocks that cooled rapidly or that rapidly lost volatiles from the ...
... rock ; for example , obsidian , scoria , pumice , perlite , ash , and Pele's hair re- fer to distinctive rocks with a vitreous texture . Vitreous texture usually forms in rocks that cooled rapidly or that rapidly lost volatiles from the ...
Page 779
... rock fragment within an intrusive igneous body that is unrelated to the igneous body itself . Xenoliths , which represent pieces of older rock incorporated into the magma while it was still fluid , may be located near their original ...
... rock fragment within an intrusive igneous body that is unrelated to the igneous body itself . Xenoliths , which represent pieces of older rock incorporated into the magma while it was still fluid , may be located near their original ...
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