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The igneous rock with glassy texture is ___________

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The igneous rock with glassy texture is ___________

(a) Gabbro

(b) Pumice

(c) Obsidian

(d) Pegmatite

I had been asked this question in an international level competition.

I would like to ask this question from Important Igneous Rocks topic in portion The Study of Rocks of Engineering Geology

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Right answer is (c) Obsidian

The explanation is: Obsidian is of glassy texture and it is the distinct property of the igneous rock which makes it easier for its identification.

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