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About C. Robert Reszka, Jr.
Expertise
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.

Experience
I have been working for the State of Michigan for 24 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.

Organizations
Michigan Basin Geological Society

Publications
Decade of North American Geology.
Bedrock Geology of Michigan

Education/Credentials
BS Wayne State University

You are here: Experts > Science > Geology > Geology > Agates

Topic: Geology

Expert: C. Robert Reszka, Jr.
Date: 6/7/2008
Subject: Agates

Question
How can I tell if the agate in my yard is worth any money?

Answer
Hi Beth,
There are many types of agate, I think the technical term is "zillions" so the only way to reliably tell if yours is worth something is to take it to a reputable dealer in minerals. You might be able to find one in the "Yellow Pages" or perhaps the Geology Department in your local university might help. Local rock clubs have a lot of expertise, you might try them. Many sites on the Internet talk about agates. Here are three that I found:

http://www.peora.com/custom.aspx?id=5

http://www.gemsociety.org/info/gems/chalcedony.htm

http://www.earthquestminerals.com/agate%20gallery.htm

Hope this helps
Bob

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