Beautiful Rainbow Bismuth

This beautiful Bismuth specimen weighs 35.4 g. It has  absolutely gorgeous rainbow coloring. It measures approx 2.5cm x 3cm x 3cm

Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth may occur naturally, and its sulfide and oxide forms are important commercial ores. Wikipedia

Symbol: Bi

Atomic number: 83

Bismuth crystals can grow in an odd, staircase-shaped, almost pyramid like formation. It has greater growth rate on its outside edges than on the inside edge when it cools making these interesting patterns. Bismuth has one of the lowest levels of thermal conductivity of any metal other than mercury.