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The type of vein commonly found in igneous rocks is _____________

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The type of vein commonly found in igneous rocks is _____________

(a) Fissure-veins

(b) Ladder-veins

(c) Gash-veins

(d) Stock works

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

Question is from Origin of Ore Deposits in division Economic Mineral Deposits of Engineering Geology

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Correct choice is (b) Ladder-veins

To explain I would say: Ladder-veins are commonly found in igneous rocks such as dykes and similar bodies and consist of transverse, roughly regularly spaced fractures that are filled with deposits of economic minerals.

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