I can answer any general geology question (rocks, minerals, stratigraphy, geomorphology etc.). My expertise is in the geology of the Michigan Basin, PreCambrian, Paleozoic and Recent. I can answer questions concerning mining and petroleum exploration and production and the laws concerning those activities. I can also answer questions concerning stratigraphy of the Michigan Basin. I will also answer questions about mineral and rock collecting in the Basin. I won`t be able to answer many specific questions on hydrology, geophysics or geochemistry. I may be able to answer very general questions in those venues.
I have been working for the State of Michigan for 36 years as a Geologist and a Resource Analyst. I have experience with Subsurface Geology and Petroleum Geology, mining in Michigan, and Sand Dune Mining and Protection issues.
Michigan Basin Geological Society
Decade of North American Geology.
Bedrock Geology of Michigan
BS Wayne State University
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Hi Christopher, VERY interesting specimen! It does look very "obsidian-like" but the location speaks strongly against that. It would be very unlikely to find obsidian in Michigan. There are volcanic
Hi Richard, Interesting specimens. You don't mention where you got these from so I can't be sure of an I.D. but I think the 16" boulder appears to have unconnected holes and longitudinal depressions
Hi Tammy, It looks like you have some samples of a metamorphic rock called a "gneiss". That's a rock that has undergone a lot of temperature and pressure; enough to change it physically and mineralogically
Hi Jim, Looks like you have a rather nice piece of "chalcedony". Chalcedony is a cryptocrystalline silica mineral made mostly of quartz (SiO2). It's usually translucent and looks waxy. Like quartz
Hi Kristina, I was thinking you specimens might be pyrite or marcasite but your description of a silver color and the pictures makes me pretty certain you have metallic slag. That's the waste product
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