Eagle Rock Plume Agate Rough - Black Marcasite Old Stock picture jasper variety being from a formation that

being from a formation that dates back to the Jurassic period

famous for its iridescent labradorescence—an optical effect similar to Schiller—that causes the stone to light up in dazzling colors

Weight: Approx: 11

though given they were found in a small fossil-bearing formation

Ideal for jewelry

Eagle Rock Plume Agate Rough - Black Marcasite Old Stock picture jasper variety being from a formation thatEagle Rock Plume Agate Rough in the black marcasite variety, from the original Bill Quach collection of Central Oregon old stock. With this variety, look for the white inclusions visible from outside, which typically reveal black marcasite plume and often blue agate with marcasite running through it. A true old stock cutter from Prineville area history. SPECIFICATIONS Material: Natural Eagle Rock Plume Agate Dimensions: 114mm x 68mm x 52mm (Inches 4.