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Frosted Rocks - Mmmm!

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Saw some neato rocks in the Cajon Pass Area by the train tracks. I suspect this is a byproduct of the railroad somehow but wasn’t sure what they could be so I figured I’d share and someone smart would recognize it!

As you can see, the first rock is chocolate-glazed. The third pic is of a clear sugar-glazed rock  - much harder to see the glaze because it’s clear, just take my word for it. 

What could’ve caused this? I suspect heat was involved but past that I’m clueless. 😁 Thanks in advance!




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Looks like slag from a smelter. Not uncommon near railroad tracks transporting material to and from smelting operations.

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