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VIRTUAL FIELD TRIP TO THE KEWEENAW PENINSULA, MICHIGAN - COPPER & SILVER II
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| Arsenical copper, Isle Royale Mine, Houghton County, 10cm across. Some of the copper in the district contained up to 3% arsenic in solid solution with the copper. This alloy has a distinctly whiter color compared to the purer native copper. | Kinked copper wire. White Pine Mine 5 cm long. |
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| Copper, Central mine Seaman museum specimen. Note the dendritic form of the copper crystals 10 cm. across. | Copper wires, Central. Seaman museum specimen. These wires developed by the extremely rapid formation of dendritic copper. 4 cm. across. |
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| Copper, White Pine mine. Seaman museum specimen 6.5 cm. across. | Copper from the Keweenaw district. Note the development of the "herringbone" pattern of copper crystal growth. Specimen is 5.5 cm. across. |
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| An arborescent group of copper crystals from the White Pine mine ( 8 cm high). | Baltic Mine 4cm tall |
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| Copper wires, Champion Mine, Painesdale. Height 2.5 cm. |