Copper after Rhyloite, Calumet Conglomerate, Lake Superior Copper District, Houghton County, Michigan Miniature 2.7 x 3.2 x 5.5 cm $75. SOLD
NSMW10515
Pseudomorphs of copper after rhylolite from the Calumet Conglomerate indicate one of the richest sections of the orebody. This is a perfect example from the collection of William A. N. Severance, #97.121. original patina and no faults.