Based on the image, the dark-colored mineral composing this rock is probably magnetite.
What is an igneous rock?
An igneous rock can be defined as a type of rock that has a coarse texture and it's dark in color. Also, an igneous rock can be accurately described as a type of rock that's produced from molten magma and formed at Earth’s surface.
In this scenario, we can deduce that the dark-colored mineral composing this igneous rock is probably magnetite because of its coarse-grained texture.
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