These round markings are actually small hemispheres within the outer husk of the agate nodule. Most pieces of agate do not have "eyes," so stones that do have them are especially prized by collectors. Natural glasses: Obsidian is a natural glass formed during an eruption of silica-rich magma...
Some Crazy Lace Agate comes in colored bands of yellow, orange, golden and red. Occasionally, because of its multiple colors and light reflecting nature, the jewelers call it “Earth rainbow.” Thunder-egg Thunder Egg A Thunder Egg“Thunderegg” is a nodule-like rock, similar to a filled...