. A treatise on rocks, rock-weathering and soils;. Petrology; Soils. THE DIABASES 83 Chemical Composition of Diabase and Basalt Constituents. I n Hi lY V VI Silica (SiOa) . . Alumina (AI2O3) . Ferric iron (FesOg) . Ferrous iron (FeO). Lime (CaO) • . Magnesia (MgO) . Potash (K2O). . Soda (NagO) . . Ignition .... 63,13^ ; } 2,12 . 3,59 3,71 61,02% 2,54 3,00 46,90%
. A treatise on rocks, rock-weathering and soils;. Petrology; Soils. THE DIABASES 83 Chemical Composition of Diabase and Basalt Constituents. I n Hi lY V VI Silica (SiOa) . . Alumina (AI2O3) . Ferric iron (FesOg) . Ferrous iron (FeO). Lime (CaO) • . Magnesia (MgO) . Potash (K2O). . Soda (NagO) . . Ignition .... 63,13^ ; } 2,12 . 3,59 3,71 61,02% 2,54 3,00 46,90% Specific gravity . ^ • • « • • • * • I. Diabase: Jersey City, New Jersey (G-. W. Hawes). II. Diabase: Pal- mer Hill, Au Sable Forks, New York (J. F. Kemp). III. Melapbyr: Hoekenberg, Silesia. IV. Melaphyr, Falgendorf, Bohemia (quoted from ZirkePs Lehrbuch der PetrograpMe). Y. Quartz basalt: Snag Lake, Cali- fornia (J, S. Diller). VI. Basalt (absarokite): near Bozeman, Montana (G. P. Merrill). augite may become conyerted into hornblende, as already de- scribed (p. 36), and the rock pass over into diorite. The plagio- clase may be oligoelase, labradorite, or anortbite. Structure. — In struc- ture the diabases are holo- crystalline. Earely do the constituents possess perfect crystal outlines, but are more or less im- perfect and distorted, owing to mutual inter- ference in process of for- mation, the granular hypidiomorpkic structure of Professor Eosenbusch. The augite in the typical Fig. 4.^Mierostructure of diabase. *^™S ^^^^^^ ^^ ^^^^^ ^^^ sharply angular plates en- closing the elongated or lath-shaped crystal of plagioclase, giving. 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 Merrill, George P[erkins] 1854-. New York, London,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpetrolo, bookyear1913
