Up for sale is this lovely Optical Calcite Rhombohedron which is also known as an Icelandic Spar. Calcite naturally cleaves into the rhombohedron shape.
The double-refraction property of this crystal was important to understanding the nature of light as a wave, which was studied by the likes of Isaac Newton and Christiaan Huygens.
This piece measures : 3.4” x 2.3” x 1.3” (85mm x 59mm x 34mm)
Weight: 510g
This piece was mined out of Nueva Leon, Mexico.20-0016
