The individual gemstone beads are tube shaped and range in size from 8x4 to 14x4

Shape:  Half Oval Cabochon

Dimensions: 52x41x33 mm / 2x1

Color: Light Imperial Orange

Iceland Spar Optical Calcite | 60.8 Grams | Rhombohedral | China Lapis Lazuli The individual gemstone beads areIceland spar, formerly called Iceland crystal (Icelandic: silfurberg [slvrprk], lit. 'silver rock') and also called optical calcite, is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the polarization of light. The most common crystal structure of Iceland spar is rhombohedral, but other structures, such as scalenohedral or prismatic, can form depending on formation