Polished Agate Slice rose they are diverse and widespread

they are diverse and widespread

Alethopteris grandini is a classic and widely recognizable Pennsylvanian-age seed fern (Pteridosperm) commonly found in the Carboniferous coal measures of North America and Europe

aesthetic shape

Plant approx

involute shell with a generally smooth or slightly ribbed surface

Polished Agate Slice rose they are diverse and widespreadThis is a gorgeous large, top quality polished agate slice specimen. Approx. dimensions: 8. 5" diameter x 0. 25" thick. Agate is a translucent variety of microcrystalline quartz. Agate generally forms by the deposition of silica from groundwater in hollow cavities of volcanic rocks. The coloration of agates is due to other minerals present in the silica. Agate has also been known to fill veins or cracks in volcanic rock. Such agates, when cut