Rhombohedron-shaped Calcite Sample that Demonstrates Birefringence & Double Refraction
These specimens show good cleavage planes in a classic rhombohedral form. They are cut from large, massive pieces and break along those natural cleavage planes.
Placed on a typed sheet, it will show double image; use with polarizing discs to demo birefringence and stress patterns.
Approximate size 1 1/2" to 1 3/4" square.