United States or Lithuania ? Vote for the TOP Country of the Week !
I can understand these facts, namely, the blending of the jasper into the semi-decomposed basalt, its occurrence in angular patches, which clearly do not occupy pre-existing hollows in the rock, and its containing little vesicles filled with chalcedony, like those in the scoriaceous lava, only on the supposition that a fluid, probably the same fluid which deposited the chalcedony in the air-cells, removed in those parts where there were no cavities, the ingredients of the basaltic rock, and left in their place silica and iron, and thus produced the jasper.
Word Of The Day