SE Missouri find

[gesa5]

Need help with identification please!

 

[ishotjohnsheriff]

A fairly weathered chunk-o-granite porphyry is my guess. The greenish mineral may be epidote.

Here is a nice article on the subject:

http://dnr.mo.gov/geology/geosrv/geores/indmin/granite.htm

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[gesa5]

Thank you!