. The Vermilion iron-bearing district of Minnesota : with an atlas . SPHERULITIC TEXTURE IN THE GREENSTONES. A. Fragment taken from the periphery of a spherulitic ellipsoid. The outside of the ellipsoid is made of the finest-grained material, with an occasional soherullte. Near the center the spherulites are more numerous and larger. B. This illustrates the spherulitic character of many of the greenstones, especially those which show the ellipsoidal parting. ELY GREENSTONE. 143 When the clearly recognizable characters of the spherulites, as shownin the above illnstrations, and the extent of th
. The Vermilion iron-bearing district of Minnesota : with an atlas . SPHERULITIC TEXTURE IN THE GREENSTONES. A. Fragment taken from the periphery of a spherulitic ellipsoid. The outside of the ellipsoid is made of the finest-grained material, with an occasional soherullte. Near the center the spherulites are more numerous and larger. B. This illustrates the spherulitic character of many of the greenstones, especially those which show the ellipsoidal parting. ELY GREENSTONE. 143 When the clearly recognizable characters of the spherulites, as shownin the above illnstrations, and the extent of the distribution of thesespherulitic greenstones are taken into consideration, it is with very greatsurprise that one finds that the only recognition which the spheruliteshave received was by N. H. Winchell, who states, in his report, that thesurface of the rock is mottled by small areas of lighter color than the matrixin which they lie, and refers to them as indicating an original amygdaloidalor fragmental structure. Spherulites are now known to exist in the ancien
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeology, bookyear1903
