Could be blacksmith or ironworker's chalk, for marking on metal.
pem

On Sep 23, 2011, at 4:19 PM, James D'Angelo wrote:

Here is a good mystery artifact, especially for the historic  
archaeologists,
is my guess.  This was found near a site we recently recorded - with  
thirty
8th grade science class students I might add.  It was brought to me by  
the
former land owner who picked it somewhere between his home and the  
site many
years ago. The mysterious, but hauntingly familiar amphibolite object,  
can
be seen at: www.thegars.org on the home page.

Jim D'Angelo, RPA, PH.D.
Lawrenceville, GA

Patrick E. Martin
Professor of Archaeology and Chair
Department of Social Sciences
Michigan Technological University
Houghton, MI  49931
phone 906-487-2070,email [log in to unmask]
www.industrialarchaeology.net