Introductory Text-book of GeologyW. Blackwood and Sons, 1869 - 194 strani |
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Zadetki 1–5 od 21
Stran 37
... Felspar - Felspar - rock - Porphyry . - The laminated glassy - looking crys- tals occurring in granite are of felspar . They can be scratched by a knife , while the quartz crystals resist it . Felspar - rock ( or felstone ) and ...
... Felspar - Felspar - rock - Porphyry . - The laminated glassy - looking crys- tals occurring in granite are of felspar . They can be scratched by a knife , while the quartz crystals resist it . Felspar - rock ( or felstone ) and ...
Stran 38
... felspar , and mica , and in being more irregular and coarser in its lamination and texture . Talc . - A transparent magnesian mineral resembling mica , but softer , and not elastic . It enters largely into the early slates , called ...
... felspar , and mica , and in being more irregular and coarser in its lamination and texture . Talc . - A transparent magnesian mineral resembling mica , but softer , and not elastic . It enters largely into the early slates , called ...
Stran 40
... felspar , granite , gneiss , greenstone , basalt , trap - tuff , lava , and a few of the ores of the more abundant metals . He should also early accustom himself to describe and group these rocks according to their most obvious or main ...
... felspar , granite , gneiss , greenstone , basalt , trap - tuff , lava , and a few of the ores of the more abundant metals . He should also early accustom himself to describe and group these rocks according to their most obvious or main ...
Stran 51
... felspar , and mica , arranged in distinct grains or crystals ; and all rocks partaking of the character and appearance of granite are termed granitic . The granitic rocks are all highly crystalline ; none of their crystals are rounded ...
... felspar , and mica , arranged in distinct grains or crystals ; and all rocks partaking of the character and appearance of granite are termed granitic . The granitic rocks are all highly crystalline ; none of their crystals are rounded ...
Stran 52
... felspar , quartz , and mica , -is of a greyish colour when the crystals of felspar are dusky white , and reddish when they are coloured by the presence of iron . When the dark glassy mineral called hornblende takes the place of the mica ...
... felspar , quartz , and mica , -is of a greyish colour when the crystals of felspar are dusky white , and reddish when they are coloured by the presence of iron . When the dark glassy mineral called hornblende takes the place of the mica ...
Pogosti izrazi in povedi
abundant accumulations agency aqueous arrangement ATLAS basalt beds bituminous boulders building-stone calcareous Cambrian carboniferous chalk chemical chiefly clay clay-slate coal coal-measures coloured compact composed composition conglomerates coral-reefs corals cretaceous crust crustacea crystalline deposits districts drift earth Edition encrinites England eocene epoch estuaries existing felspar fishes formation forms fossils frequent fresh-water GEOGRAPHY geologists Geology globe gneiss granite gravel greenstone grits groups igneous rocks interstratified islands lakes laminated land Laurentian lava layers less lias lignite lime limestone lower marine marls masses Mesozoic Metamorphic mica mica-schist mineral mountain limestone numerous occur ocean Old Red Sandstone oolite origin PALEOZOIC peculiar period Permian plants and animals present quartz remains of plants reptiles rivers rocky sand schists Scotland seams seas sedimentary shales shell-fish shells silicious silt Silurian slates slaty species stone strata stratified rocks structure surface termed tertiary TEXT-BOOK texture thick tion trap trappean Triassic upheavals upper vegetable volcanic wealden zoophytes
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