These are "Conchas" Chalcedony agate rosette, composited of fine tine drusy quartz crystals. Specimen are either or both Lime green or purple fluorescence under U.V. light.Approx. 1-1/2" across. Specimen is white gray with one end folded up giving it the appearence of a clam or oster shell. lightweight at 12.5 grams. Good for wire wrapping as pendent. Rio Grande do Sul, Brazil.
