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Grain size 5mm to 1mm is termed as ______________

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Grain size 5mm to 1mm is termed as ______________

(a) Coarse grained

(b) Intermediate grained

(c) Fine grained

(d) Medium grained

The question was posed to me during an online exam.

Origin of the question is Composition and Texture of Igneous Rocks in section The Study of Rocks of Engineering Geology

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The correct answer is (d) Medium grained

The explanation: When the average grain size lies between 5 mm to 1 mm it is termed as medium grained. The use of magnifying lens often becomes necessary for identifying all the constituent mineral components.

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