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[Shiloh75]

I live in the Upper Peninsula on Lake Superior. Today I was walking around Bay Furnace which back in 1870s ran a blast furnace. Well some of the shore fell away and left a picture of layers. Top layer was dirt and grass with stone. Second layer was shiny dark rock. Third layers was a green stone, stones range in size from pebbles to muskmelon size dull on the outside but once broken swirls of dark and "lime" green. fourth layer was a foamy type coming in light green and white, easy to crumble, next layer was again the glassy black stuff with other types of rocks in it. The water level of Lake Superior was higher in the time of the blast furnace days. I will be grabbing some of the rocks tomorrow...today I just grabbed pig iron, old square nails and an old metal pin(think used on the horses back in the day).

 

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[releventchair]

Welcome to TreasureNet Shilo..
I'm south of you in the lower,east of Lake Mi..

Your green stone may be slag. Usually glassy and colors depend on type of metals usually..
But then too you are south, maybe s.e. of the greenstone region in Ontario.. Volcanic reasons I think for the greens there.
Unless they covered the slag layer there at the furnace with a layer of stone,(not real likely?) rather than just spreading or dumping it in piles, your layer might relate to the greenstone region through glacial activity or previous volcanic cause?
Some pics of samples and somebody here might be able to take a guess.

 

[parsonwalker]

Welcome Shiloh. This forum is a great place to find answers to a whole variety of questions. Happy hunting!

 

[releventchair]

Sample pics of the rock layer above the green stone layer might help too.
If it was crushed in mining operations or if smooth from glacial or lake action or a hard solid layer. Mixed or same type and material.

 

[vpnavy]

Pictures would sure help.