NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Fw: Viking sunstone
From: Paolo Borchetta
Date: 2013 Mar 6, 22:01 -0800
From: Paolo Borchetta
Date: 2013 Mar 6, 22:01 -0800
Believed to be either Calcite or Iolite crystals.
http://www.nordskip.com/calciteoptics.html
See also David Burch "EMERGENCY NAVIGATION" pages 121,122,123.
Paolo
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