A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Noell Wilson
Date: 2015 Aug 29, 20:11 -0700
Being sort of gulible, I ordered "20 optical rough calcite mini rough crystals" so I could play Viking. Didn't work on a cloudy day. No sun image on a paper and I couldn't detect any spots of brightness to mention when I looked through them. The crystals are about 1/4 to 3/8" across and I probably have 19 left.
It seemed like a good idea at the time.