The Eagle Mine of the Upper Peninsula, Michigan is host to a productive copper-nickel, sulfide-rich ore deposit that is hosted within the Yellow Dog Intrusion, a mafic intrusive igneous rock. The origin of the ore and ...

Gemmy hydrothermal quartz crystals typically exhibit each of their six prism and six rhombohedral crystal faces. However, discerning which of the crystal faces were actively growing at any given time during construction ...

Glass trade beads made in Europe were an important commodity in colonial North America. The style and composition of glass beads were unique to each manufacturing site and can be used today to trace trading relationships ...

Glass beads manufactured in Europe were brought to North America and used in trade with native American peoples. The style and composition of glass beads can be used to trace intercontinental connections between the 16th ...