http://www.kalsedon.com.tr/eng/main.htm shows the mining of blue
chalcedony. I hope you find it useful.
N.Durucu
Instructor
Gaziantep University
Turkey
http://www.kalsedon.com.tr/eng/main.htm shows the mining of blue
chalcedony. I hope you find it useful.
N.Durucu
Instructor
Gaziantep University
Turkey