soaking in iron sulphate solution, according to Gemology Online. According to Marbles Galore, the blue color was created in Idar-Oberstein by soaking in potassium ferro-cyanide for three weeks. Then the agates are soaked in a solution of ferrous sulfate for 10 days and laid out to dry in th...
In the United States, agates are mostly found in Oregon, Washington, Idaho and Montana. Other southwestern and western states can be good agate localities – visit Arizona for fire agate and petrified wood, California for Mojave blue agate, or Colorado and Utah for some really amazing agates, ...
4. True or false: Geodes and agates are formed in the same way. False. Agates develop as successive deposits of silica precipitate out of groundwater, filling the cavity completely. In contrast, geodes form when the mineral deposits do not completely fill the cavity. Learn More: What Are Ge...
sanding the surface until the roughness created with the 100 grit is smoothed out. Switch to 400, then 800, then 1200-grit sandpapers, using each to pass over the fossil surface removing the
If a larger amount of electrical charge is injected into a specimen, very dense dendritic discharges can be created such as in Figure 1 below. These very dense discharges are similar in appearance to fern fronds ("filiciform") or plume agates. Specimens exhibiting this form were heavily ...