. Annalen der New Yorker Akademie der Wissenschaften. Wissenschaft; Wissenschaft - New York (State). FENNER, den WATCHUNG BASALT 133" von 10-15 mm. und viel größeren Gelegentlich erscheinen. Es ist in der Regel farblos, aber nicht selten amethystine, seltener rauchig. Die Gesichter gezeigt werden, sind in der Regel einfache Kombinationen von Prisma und Pyramide. Zusätzlich zu den Gruppen von Euhedral Kristalle, die sind am häufigsten, körnige Aggregate manchmal auftreten, sowie Einlagen von chalcedonic Kieselsäure. Häufig werden Proben gefunden, die zahlreichen Hohlräume, indi - klar erscheint der Ausbau von Gruppen von Kristalle zeigen

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. Annals of the New York Academy of Sciences. Science; Science -- New York (State). FENNER, THE WATCHUNG BASALT 133 "of 10-15 mm., and much larger ones occasionally appear. It is generally colorless, but not infrequently amethystine, and more rarely smoky. The faces shown are usually simple combinations of prism and pyramid. In addition to the groups of euhedral crystals which are most common, granular aggregates sometimes occur, as well as deposits of chalcedonic silica. Frequently specimens are found which show numerous cavities, indi- cating plainly the removal of groups of crystals of some mineral which was intergrown with the quartz. Most of the cavities are diamond-shaped in cross-section, but others are apparently rectangular. They are un- doubtedly due to the removal of groups of crystals, but the forms do not suggest those of any of the species known from these localities. It ap- pears most probable that among the various transformations experienced one or more minerals disappeared completely. There are indications that formation and removal occurred early in the history of the series, for at times the cavities have been filled with later-deposited quartz. Replacement of Quartz In slide 70, of which the hand specimen consists principally of dato- lite, heulandite and natrolite, the datolite, under the microscope, is seen to contain at one place a small group of albite crystals, greatly corroded. Fig. 8. Fragments of quartz outlining former crystal, now almost completely replaced by datolite. X 35. Slide 70. as previously described, and scattered through the datolite are minute remnants of quartz. One occurrence takes the form shown in fig. 8. It is clear that the scattered particles are portions of the pyramidal termina-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. New York Acad

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• bookcentury1800
• bookdecade1870
• booksubjectscience
• bookyear1879