Garnet and opal are Idaho's most important gems, but many others have been produced in the state. Author: Hobart M. King, Ph.D., GIA Graduate Gemologist Idaho Harlequin Opal: Photo of a harlequin opal triplet from the Constellation Mine near Spencer, Idaho. It is 6 millimeters by 4 millimeters in size.
Mineral Properties and Uses Article by: Hobart M. King, Ph.D., RPG Arsenopyrite and milky quartz on limestone from the Smith Vein, Carrock Mine, Caldbeck Fells, Cumberland, Cumbria, England. Specimen is approximately 8.8 x 6.2 x 4.8 centimeters in size. Specimen and photo by Arkenstone / www.iRocks.com.
The same hardness, but much tougher than other varieties of diamond. Author: Hobart M. King, Ph.D., GIA Graduate Gemologist Carbonado Diamonds are usually black or gray in color and irregular in shape. Upon close examination, their porous texture is usually obvious. They typically exhibit a luster that might be perceived as glassy, submetallic, or adamantine.
Article by: Hobart M. King, Ph.D., RPG Triboluminescence: YouTube video demonstration of triboluminescence. We use two pieces of milky quartz to produce a few flashes of light. You can easily find other minerals that exhibit triboluminescence. About 50% of all crystalline substances exhibit the property .
County Maps for Neighboring States: Arizona Colorado Oklahoma Texas Utah New Mexico on a USA Wall Map New Mexico Delorme Atlas New Mexico on Google Earth The map above is a Landsat satellite image of New Mexico with County boundaries superimposed. We have a more detailed satellite image of New Mexico without County boundaries.