slag

Green Gabbro

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Friday Rock Blogging: Slag

Coal doesn’t burn completely. Here’s what’s left over. (Do I apologize for the weak blogging? No! No apologies! I am still trying to work “elusive”, “obsequious”, and “vapid” into a discussion of bedrock hydrogeology. “Propinquitous”, though, that’s taken care of. Also, I am contemplating cheesy steganography.)