What's a good hunt without a metal rock? l.o.l..
I can't tell much from upper piece in picture. It could be a chunk of coal?
Iron exists in some places. Sometimes in rocks too! High iron in water leaves stains. But a stone can collect iron that way too maybe.
Your lower rock looks like a "clinker" out of a coal burner. Stove? Steam engine? But impurities that got real hot regardless.. You'll likely find another eventually. If from a stove they should be in the same area mostly where dumped. Unless kids tossed them around or a pile was spread out to level an area . (They can be used for making paths /trails to walk on. )
[Coal that contains more water, along with minerals like calcium, sodium, potassium, pyrite or iron, can break down inside the coal and mix with air, moisture and each other. Debris that resembles lava rocks and volcanic ash results. These clinkers then impede the transfer of heat.]
What Causes Clinkers In Coal-Fired Boilers?
Coal-fired boilers sometimes develop clinkers,which are leftover chunks of coal that didn't burn properly. There are ways to prevent clinkers, such as using high-quality coal and a properly functioning coal boiler.
www.hunker.com
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