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Example of directive texture is ______________

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Example of directive texture is ______________

(a) Tracheod

(b) Granitic

(c) Trachytic

(d) Porphyritic

I have been asked this question in final exam.

This intriguing question comes from Composition and Texture of Igneous Rocks topic in chapter The Study of Rocks of Engineering Geology

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The correct answer is (c) Trachytic

The explanation is: Trachytic and Trachytoid textures are common examples of directive textures. The former is characteristic of certain felspar lavas and is recognised by a parallel arrangement of felspar; the latter is found in some syenites.

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