trachytic

/ trəˈkɪtɪk /

adjective

(of the texture of certain igneous rocks) characterized by a parallel arrangement of crystals, which mark the flow of the lava when still molten

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They are laccolites of trachytic rock, and raised the Tertiary beds above them in the form of blisters.

The trachytic rocks are small in quantity compared with those of the basaltic class.

In Porto Santo the trachytic rocks bear a much greater proportion to the basaltic than in Madeira.

Chimborazo is very likely not a solid mountain; trachytic volcanoes are supposed to be full of cavities.

These trachytic lavas would seem to be more ancient than the basaltic, previously described.

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