Rock and Mineral Identification
April 17, 2014 | Geology.com Store
The ability to identify rocks and minerals in the field is a very important skill. The Geology.com store has a selection of rock, mineral, fossil and gem mineral kits that can be used for learning and practice. Testing tools are also available.
February 27, 2014 | Geology.com
Chrysoberyl is an extreme gem. At 8.5 on the Mohs Scale it is the third hardest gem mineral. At 3.7 to 3.8 it has a very high specific gravity for a non-metallic mineral. It is the gem with the finest cat's eye. And, some specimens change color depending upon the type of incident light.
Gemstones and Plate Tectonics
June 18, 2013 | Geology
A recent article in Geology explains how the global distributions of jadeite and ruby are strongly associated with certain types of plate boundaries.