Free Online Gemology Courses
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Author:  Barbara O. Ellis [ Sat Sep 16, 2006 12:45 pm ]
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Dr. Barbara -- :smt033 Thank you, thank you, thank you!!! I finally understand what the plus and minus signs mean for ions! I hope when I reach the crystal system section of your lessons I'll finally get a grip on those as well! [-o<

Author:  dragonstek [ Thu Nov 15, 2007 4:58 pm ]
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HI All

i found another resourse for gemstoneswith review questions on it

its GEOLOGY G130:GEMSTONES Fall 2001

if your looking for review questions :wink:

Author:  dragonstek [ Mon Sep 08, 2008 5:06 pm ]
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i found these site while searching for gemstone info , lots of great articles written here

check it out :wink:

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