Leland blue stone

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150 year Lake Michigan beach-tumbled slag glass specimens.  Created during the iron smelting / purification process of the mid 19th century. The main impurity in the raw iron was silica (glass). The iron was melted using the intense heat of a hardwood fired blast furnace. The slag floated to the top and was skimmed off and discarded in the big lake. It has tumbled in the waves for over a century. Petosky Stone, Lake Michigan Stones, Leland Blue Stone, Michigan Rocks, Blast Furnace, Rock Tumbling, Rocks And Fossils, Rock Hunting, Big Lake

150 year Lake Michigan beach-tumbled slag glass specimens. Created during the iron smelting / purification process of the mid 19th century. The main impurity in the raw iron was silica (glass). The iron was melted using the intense heat of a hardwood fired blast furnace. The slag floated to the top and was skimmed off and discarded in the big lake. It has tumbled in the waves for over a century.

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