Pleochroism
Videos
Pleochroism is an optical phenomenon in which a substance has different colors when positioned at different angles with respect to linearly polarized light.
Pleochroism of cordierite shown by rotating a polarizing filter on the lens of the camera
Pleochroism of tourmaline shown by rotating a polarizing filter on the lens of the camera
Tanzanite
Videos
Tanzanite is the blue and violet variety of the mineral zoisite. The color is caused by small amounts of vanadium. Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro
Pleochroism
…Corundum (strong): dark violet-blue / light blue-green Tanzanite See Zoisite Topaz (very low): colorless / pale blue / pink…
Craft work on tanzanite
Multicolored tanzanite crystal
Untreated tanzanite gemstone