This is a xl absolute beauty of a sphere! Over 3lbs and 98mm. Optical Calcite or Iceland spar, formerly known as Iceland crystal, is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the polarization of light. It occurs in large readily cleavable crystals, easily divisible into rhombs, and is remarkable for its double refraction. Historically, the phenomena of this crystal were studied at length by Christiaan Huygens and Isaac Newton. Sir George Stokes also studied the phenomenon.
You can read a newspaper through Optical Clear Calcite! You're not seeing double when you look through them, though; when light passes through this transparent Calcite it bends two ways, making images appear double. These Calcite pieces naturally form parallelogram shapes, making them excellent pieces for energy grids.
Optical Calcite, Centuries old Viking legends attribute their navigational success to the use of mysterious, glowing “sunstones” to find the position of the sun and set the ship’s course even on cloudy days. Although still controversial, many researchers now believe that these “magical sunstones” were in fact Iceland spar.
Chlorite - is used for spiritual healing, energy work, and purifying the aura. It can also be used to cleanse and protect!