I'm formulating a planet that has silver dust on its surface, and ideally has rivers of mercury flowing on it, possible? Human survival not necessary

I'm new to this and my scientific knowledge is massively lacking in this area (so please take it easy on me!) I'm writing a historical science-fiction novel. Parts of it set in the past (1977) and some of it set in the not so distant future.

I need to create a planet that has a layer of silver dust (not necessarily the element/metal silver, but silver in appearance) that covers the entire planet's surface. From a distant solar system, does not need to be similar to our solar system. I would also like to include rivers/lakes of mercury on the surface of the planet. Is it possible for a planet like this to exist and what would its chemical make-up be? Humans do not need to be able to survive there or even visit. Just two metal robots/spacecrafts... one is from Earth (launched 1977, Voyager) and one is from another planet (Robot, very sophisticated).

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I'm formulating a planet that has silver dust on its surface, and ideally has rivers of mercury flowing on it, possible? Human survival not necessary

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