A planet made of iron

Our planet has a surface full of silicates and a core made of iron. It's due to this that Earth is the way it mostly is - most rocks and many minerals contain some form of silica. But what about a planet with an iron surface and a core of, let's say, mercury (to have an element denser than iron)? This isn't to say that this planet is purely iron and mercury, but it has the ratios of what we have of silica and iron, respectively. (This would mean that ~90% of this planet's crust would be iron.)

Is such a planet feasible? And if so, how would that affect plate tectonics and development of life, if life is even possible on this kind of world?

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A planet made of iron

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