. Annals of the New York Academy of Sciences. Science. 140 The Monoclinic Pyroxenes of New York State. The section giving a perfectly symmetrical and satisfactory interference figure was obtained at every trial. The smallest crystal sectioned was three-eighths of an inch long and the same in width. Etchfigukes. Crystals of diopside from DeKalb and augite from Piteairn, showing smooth and bright faces, were treated with warm hydro- fluoric acid for several minutes, and in both cases with the follow- ing results:. On the prism face there was produced an acute angled triangle, whose longer side w
. Annals of the New York Academy of Sciences. Science. 140 The Monoclinic Pyroxenes of New York State. The section giving a perfectly symmetrical and satisfactory interference figure was obtained at every trial. The smallest crystal sectioned was three-eighths of an inch long and the same in width. Etchfigukes. Crystals of diopside from DeKalb and augite from Piteairn, showing smooth and bright faces, were treated with warm hydro- fluoric acid for several minutes, and in both cases with the follow- ing results:. On the prism face there was produced an acute angled triangle, whose longer side was parallel, or very nearly so, to the edge 110 A 010. The acute angle always pointed towards the positive hemipyramid, while the obtuse augle pointed towards the ortho- pinacoid. On the orthopinacoid the etchfigures were irregularly deltoid in outline, with the lower end rounded, and the upper end always drawn out into a point which was towards the negative hemi- pyramid. Somewhat irregular figures were produced on the clinopinacoid,. 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 New York Academy of Sciences. New York, New York Academy of Sciences
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
